diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 65b09f2c49..d2222fb720 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -70657,14 +70657,7 @@
             "$ref": "#/components/schemas/ilm._types:Actions"
           },
           "min_age": {
-            "oneOf": [
-              {
-                "$ref": "#/components/schemas/_types:Duration"
-              },
-              {
-                "type": "number"
-              }
-            ]
+            "$ref": "#/components/schemas/_types:Duration"
           }
         }
       },
@@ -93117,7 +93110,7 @@
             "type": "number"
           },
           "phases": {
-            "$ref": "#/components/schemas/ilm._types:Phases"
+            "$ref": "#/components/schemas/xpack.usage:Phases"
           }
         },
         "required": [
@@ -93125,6 +93118,44 @@
           "phases"
         ]
       },
+      "xpack.usage:Phases": {
+        "type": "object",
+        "properties": {
+          "cold": {
+            "$ref": "#/components/schemas/xpack.usage:Phase"
+          },
+          "delete": {
+            "$ref": "#/components/schemas/xpack.usage:Phase"
+          },
+          "frozen": {
+            "$ref": "#/components/schemas/xpack.usage:Phase"
+          },
+          "hot": {
+            "$ref": "#/components/schemas/xpack.usage:Phase"
+          },
+          "warm": {
+            "$ref": "#/components/schemas/xpack.usage:Phase"
+          }
+        }
+      },
+      "xpack.usage:Phase": {
+        "type": "object",
+        "properties": {
+          "actions": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          },
+          "min_age": {
+            "$ref": "#/components/schemas/_types:DurationValueUnitMillis"
+          }
+        },
+        "required": [
+          "actions",
+          "min_age"
+        ]
+      },
       "xpack.usage:MachineLearning": {
         "allOf": [
           {
diff --git a/output/schema/schema.json b/output/schema/schema.json
index dd062ded54..2ed134f86d 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -124572,7 +124572,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L42-L96"
+      "specLocation": "ilm/_types/Phase.ts#L39-L93"
     },
     {
       "kind": "interface",
@@ -124670,7 +124670,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L136-L142"
+      "specLocation": "ilm/_types/Phase.ts#L133-L139"
     },
     {
       "kind": "interface",
@@ -124691,7 +124691,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L152-L154"
+      "specLocation": "ilm/_types/Phase.ts#L149-L151"
     },
     {
       "kind": "interface",
@@ -124723,7 +124723,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L115-L118"
+      "specLocation": "ilm/_types/Phase.ts#L112-L115"
     },
     {
       "kind": "interface",
@@ -124755,7 +124755,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L126-L129"
+      "specLocation": "ilm/_types/Phase.ts#L123-L126"
     },
     {
       "kind": "interface",
@@ -124776,7 +124776,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L144-L146"
+      "specLocation": "ilm/_types/Phase.ts#L141-L143"
     },
     {
       "kind": "interface",
@@ -124797,31 +124797,18 @@
           }
         },
         {
-          "esQuirk": "output as a millis number in XPack usage stats, which cannot roundtrip with a Duration as it requires a unit.",
           "name": "min_age",
           "required": false,
           "type": {
-            "kind": "union_of",
-            "items": [
-              {
-                "kind": "instance_of",
-                "type": {
-                  "name": "Duration",
-                  "namespace": "_types"
-                }
-              },
-              {
-                "kind": "instance_of",
-                "type": {
-                  "name": "long",
-                  "namespace": "_types"
-                }
-              }
-            ]
+            "kind": "instance_of",
+            "type": {
+              "name": "Duration",
+              "namespace": "_types"
+            }
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L26-L32"
+      "specLocation": "ilm/_types/Phase.ts#L26-L29"
     },
     {
       "kind": "interface",
@@ -124886,7 +124873,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L34-L40"
+      "specLocation": "ilm/_types/Phase.ts#L31-L37"
     },
     {
       "kind": "interface",
@@ -125039,7 +125026,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L102-L113"
+      "specLocation": "ilm/_types/Phase.ts#L99-L110"
     },
     {
       "kind": "interface",
@@ -125071,7 +125058,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L131-L134"
+      "specLocation": "ilm/_types/Phase.ts#L128-L131"
     },
     {
       "kind": "interface",
@@ -125092,7 +125079,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L98-L100"
+      "specLocation": "ilm/_types/Phase.ts#L95-L97"
     },
     {
       "kind": "interface",
@@ -125135,7 +125122,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L120-L124"
+      "specLocation": "ilm/_types/Phase.ts#L117-L121"
     },
     {
       "kind": "interface",
@@ -125156,7 +125143,7 @@
           }
         }
       ],
-      "specLocation": "ilm/_types/Phase.ts#L148-L150"
+      "specLocation": "ilm/_types/Phase.ts#L145-L147"
     },
     {
       "kind": "request",
@@ -227581,7 +227568,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L328-L330"
+      "specLocation": "xpack/usage/types.ts#L340-L342"
     },
     {
       "kind": "interface",
@@ -227690,7 +227677,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L59-L69"
+      "specLocation": "xpack/usage/types.ts#L58-L68"
     },
     {
       "kind": "interface",
@@ -227717,7 +227704,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L46-L48"
+      "specLocation": "xpack/usage/types.ts#L45-L47"
     },
     {
       "kind": "interface",
@@ -227747,7 +227734,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L71-L73"
+      "specLocation": "xpack/usage/types.ts#L70-L72"
     },
     {
       "kind": "interface",
@@ -227779,7 +227766,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L28-L31"
+      "specLocation": "xpack/usage/types.ts#L27-L30"
     },
     {
       "kind": "interface",
@@ -227817,7 +227804,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L332-L335"
+      "specLocation": "xpack/usage/types.ts#L344-L347"
     },
     {
       "kind": "interface",
@@ -227849,7 +227836,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L33-L36"
+      "specLocation": "xpack/usage/types.ts#L32-L35"
     },
     {
       "kind": "interface",
@@ -227887,7 +227874,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L79-L82"
+      "specLocation": "xpack/usage/types.ts#L78-L81"
     },
     {
       "kind": "interface",
@@ -228007,7 +227994,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L84-L95"
+      "specLocation": "xpack/usage/types.ts#L83-L94"
     },
     {
       "kind": "interface",
@@ -228084,7 +228071,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L337-L347"
+      "specLocation": "xpack/usage/types.ts#L349-L359"
     },
     {
       "kind": "interface",
@@ -228105,7 +228092,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L75-L77"
+      "specLocation": "xpack/usage/types.ts#L74-L76"
     },
     {
       "kind": "interface",
@@ -228154,7 +228141,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L349-L352"
+      "specLocation": "xpack/usage/types.ts#L361-L364"
     },
     {
       "kind": "interface",
@@ -228241,7 +228228,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L97-L105"
+      "specLocation": "xpack/usage/types.ts#L96-L104"
     },
     {
       "kind": "interface",
@@ -228306,7 +228293,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L107-L113"
+      "specLocation": "xpack/usage/types.ts#L106-L112"
     },
     {
       "kind": "interface",
@@ -228371,7 +228358,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L115-L121"
+      "specLocation": "xpack/usage/types.ts#L114-L120"
     },
     {
       "kind": "interface",
@@ -228403,7 +228390,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L123-L126"
+      "specLocation": "xpack/usage/types.ts#L122-L125"
     },
     {
       "kind": "interface",
@@ -228479,7 +228466,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L128-L135"
+      "specLocation": "xpack/usage/types.ts#L127-L134"
     },
     {
       "kind": "interface",
@@ -228500,7 +228487,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L38-L40"
+      "specLocation": "xpack/usage/types.ts#L37-L39"
     },
     {
       "kind": "interface",
@@ -228527,7 +228514,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L354-L356"
+      "specLocation": "xpack/usage/types.ts#L366-L368"
     },
     {
       "kind": "interface",
@@ -228554,7 +228541,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L358-L360"
+      "specLocation": "xpack/usage/types.ts#L370-L372"
     },
     {
       "kind": "interface",
@@ -228581,7 +228568,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L151-L153"
+      "specLocation": "xpack/usage/types.ts#L150-L152"
     },
     {
       "kind": "interface",
@@ -228616,7 +228603,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L160-L163"
+      "specLocation": "xpack/usage/types.ts#L172-L175"
     },
     {
       "kind": "interface",
@@ -228643,12 +228630,12 @@
             "kind": "instance_of",
             "type": {
               "name": "Phases",
-              "namespace": "ilm._types"
+              "namespace": "xpack.usage"
             }
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L155-L158"
+      "specLocation": "xpack/usage/types.ts#L167-L170"
     },
     {
       "kind": "interface",
@@ -228669,7 +228656,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L42-L44"
+      "specLocation": "xpack/usage/types.ts#L41-L43"
     },
     {
       "kind": "interface",
@@ -228701,7 +228688,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L165-L168"
+      "specLocation": "xpack/usage/types.ts#L177-L180"
     },
     {
       "kind": "interface",
@@ -228777,7 +228764,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L362-L368"
+      "specLocation": "xpack/usage/types.ts#L374-L380"
     },
     {
       "kind": "interface",
@@ -228871,7 +228858,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L370-L377"
+      "specLocation": "xpack/usage/types.ts#L382-L389"
     },
     {
       "kind": "interface",
@@ -228892,7 +228879,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L253-L255"
+      "specLocation": "xpack/usage/types.ts#L265-L267"
     },
     {
       "kind": "interface",
@@ -228946,7 +228933,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L175-L180"
+      "specLocation": "xpack/usage/types.ts#L187-L192"
     },
     {
       "kind": "interface",
@@ -228989,7 +228976,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L182-L186"
+      "specLocation": "xpack/usage/types.ts#L194-L198"
     },
     {
       "kind": "interface",
@@ -229010,7 +228997,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L192-L194"
+      "specLocation": "xpack/usage/types.ts#L204-L206"
     },
     {
       "kind": "interface",
@@ -229031,7 +229018,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L188-L190"
+      "specLocation": "xpack/usage/types.ts#L200-L202"
     },
     {
       "kind": "interface",
@@ -229091,7 +229078,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L196-L204"
+      "specLocation": "xpack/usage/types.ts#L208-L216"
     },
     {
       "kind": "interface",
@@ -229145,7 +229132,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L225-L230"
+      "specLocation": "xpack/usage/types.ts#L237-L242"
     },
     {
       "kind": "interface",
@@ -229166,7 +229153,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L232-L234"
+      "specLocation": "xpack/usage/types.ts#L244-L246"
     },
     {
       "kind": "interface",
@@ -229220,7 +229207,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L206-L211"
+      "specLocation": "xpack/usage/types.ts#L218-L223"
     },
     {
       "kind": "interface",
@@ -229263,7 +229250,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L236-L240"
+      "specLocation": "xpack/usage/types.ts#L248-L252"
     },
     {
       "kind": "interface",
@@ -229334,7 +229321,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L213-L223"
+      "specLocation": "xpack/usage/types.ts#L225-L235"
     },
     {
       "kind": "interface",
@@ -229432,7 +229419,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L242-L251"
+      "specLocation": "xpack/usage/types.ts#L254-L263"
     },
     {
       "kind": "interface",
@@ -229464,7 +229451,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L170-L173"
+      "specLocation": "xpack/usage/types.ts#L182-L185"
     },
     {
       "kind": "interface",
@@ -229513,7 +229500,116 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L379-L382"
+      "specLocation": "xpack/usage/types.ts#L391-L394"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "Phase",
+        "namespace": "xpack.usage"
+      },
+      "properties": [
+        {
+          "name": "actions",
+          "required": true,
+          "type": {
+            "kind": "array_of",
+            "value": {
+              "kind": "instance_of",
+              "type": {
+                "name": "string",
+                "namespace": "_builtins"
+              }
+            }
+          }
+        },
+        {
+          "name": "min_age",
+          "required": true,
+          "type": {
+            "kind": "instance_of",
+            "generics": [
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "UnitMillis",
+                  "namespace": "_types"
+                }
+              }
+            ],
+            "type": {
+              "name": "DurationValue",
+              "namespace": "_types"
+            }
+          }
+        }
+      ],
+      "specLocation": "xpack/usage/types.ts#L154-L157"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "Phases",
+        "namespace": "xpack.usage"
+      },
+      "properties": [
+        {
+          "name": "cold",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Phase",
+              "namespace": "xpack.usage"
+            }
+          }
+        },
+        {
+          "name": "delete",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Phase",
+              "namespace": "xpack.usage"
+            }
+          }
+        },
+        {
+          "name": "frozen",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Phase",
+              "namespace": "xpack.usage"
+            }
+          }
+        },
+        {
+          "name": "hot",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Phase",
+              "namespace": "xpack.usage"
+            }
+          }
+        },
+        {
+          "name": "warm",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "Phase",
+              "namespace": "xpack.usage"
+            }
+          }
+        }
+      ],
+      "specLocation": "xpack/usage/types.ts#L159-L165"
     },
     {
       "kind": "interface",
@@ -229567,7 +229663,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L257-L262"
+      "specLocation": "xpack/usage/types.ts#L269-L274"
     },
     {
       "kind": "interface",
@@ -229695,7 +229791,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L415-L424"
+      "specLocation": "xpack/usage/types.ts#L427-L436"
     },
     {
       "kind": "interface",
@@ -229716,7 +229812,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L264-L266"
+      "specLocation": "xpack/usage/types.ts#L276-L278"
     },
     {
       "kind": "request",
@@ -230123,7 +230219,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L268-L271"
+      "specLocation": "xpack/usage/types.ts#L280-L283"
     },
     {
       "kind": "interface",
@@ -230153,7 +230249,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L273-L275"
+      "specLocation": "xpack/usage/types.ts#L285-L287"
     },
     {
       "kind": "interface",
@@ -230320,7 +230416,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L277-L292"
+      "specLocation": "xpack/usage/types.ts#L289-L304"
     },
     {
       "kind": "interface",
@@ -230369,7 +230465,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L426-L430"
+      "specLocation": "xpack/usage/types.ts#L438-L442"
     },
     {
       "kind": "interface",
@@ -230539,7 +230635,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L432-L445"
+      "specLocation": "xpack/usage/types.ts#L444-L457"
     },
     {
       "kind": "interface",
@@ -230582,7 +230678,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L294-L298"
+      "specLocation": "xpack/usage/types.ts#L306-L310"
     },
     {
       "kind": "interface",
@@ -230603,7 +230699,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L306-L308"
+      "specLocation": "xpack/usage/types.ts#L318-L320"
     },
     {
       "kind": "interface",
@@ -230646,7 +230742,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L310-L314"
+      "specLocation": "xpack/usage/types.ts#L322-L326"
     },
     {
       "kind": "interface",
@@ -230689,7 +230785,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L316-L320"
+      "specLocation": "xpack/usage/types.ts#L328-L332"
     },
     {
       "kind": "interface",
@@ -230732,7 +230828,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L300-L304"
+      "specLocation": "xpack/usage/types.ts#L312-L316"
     },
     {
       "kind": "interface",
@@ -230770,7 +230866,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L447-L450"
+      "specLocation": "xpack/usage/types.ts#L459-L462"
     },
     {
       "kind": "interface",
@@ -230830,7 +230926,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L384-L387"
+      "specLocation": "xpack/usage/types.ts#L396-L399"
     },
     {
       "kind": "interface",
@@ -230862,7 +230958,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L389-L392"
+      "specLocation": "xpack/usage/types.ts#L401-L404"
     },
     {
       "kind": "interface",
@@ -230911,7 +231007,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L452-L456"
+      "specLocation": "xpack/usage/types.ts#L464-L468"
     },
     {
       "kind": "interface",
@@ -230960,7 +231056,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L458-L462"
+      "specLocation": "xpack/usage/types.ts#L470-L474"
     },
     {
       "kind": "interface",
@@ -231001,7 +231097,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L410-L413"
+      "specLocation": "xpack/usage/types.ts#L422-L425"
     },
     {
       "kind": "interface",
@@ -231033,7 +231129,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L394-L396"
+      "specLocation": "xpack/usage/types.ts#L406-L408"
     },
     {
       "kind": "interface",
@@ -231120,7 +231216,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L398-L403"
+      "specLocation": "xpack/usage/types.ts#L410-L415"
     },
     {
       "kind": "interface",
@@ -231152,7 +231248,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L405-L408"
+      "specLocation": "xpack/usage/types.ts#L417-L420"
     },
     {
       "kind": "interface",
@@ -231190,7 +231286,7 @@
           }
         }
       ],
-      "specLocation": "xpack/usage/types.ts#L464-L467"
+      "specLocation": "xpack/usage/types.ts#L476-L479"
     },
     {
       "kind": "interface",
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 077fc5c295..d0dda55c91 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -10834,7 +10834,7 @@ export interface IlmMigrateAction {
 
 export interface IlmPhase {
   actions?: IlmActions
-  min_age?: Duration | long
+  min_age?: Duration
 }
 
 export interface IlmPhases {
@@ -21737,7 +21737,7 @@ export interface XpackUsageIlm {
 
 export interface XpackUsageIlmPolicyStatistics {
   indices_managed: integer
-  phases: IlmPhases
+  phases: XpackUsagePhases
 }
 
 export interface XpackUsageInvocations {
@@ -21849,6 +21849,19 @@ export interface XpackUsageMonitoring extends XpackUsageBase {
   enabled_exporters: Record<string, long>
 }
 
+export interface XpackUsagePhase {
+  actions: string[]
+  min_age: DurationValue<UnitMillis>
+}
+
+export interface XpackUsagePhases {
+  cold?: XpackUsagePhase
+  delete?: XpackUsagePhase
+  frozen?: XpackUsagePhase
+  hot?: XpackUsagePhase
+  warm?: XpackUsagePhase
+}
+
 export interface XpackUsageQuery {
   count?: integer
   failed?: integer
diff --git a/specification/ilm/_types/Phase.ts b/specification/ilm/_types/Phase.ts
index 397a64d24d..2b8a36e016 100644
--- a/specification/ilm/_types/Phase.ts
+++ b/specification/ilm/_types/Phase.ts
@@ -25,10 +25,7 @@ import { Duration, DurationLarge } from '@_types/Time'
 
 export class Phase {
   actions?: Actions
-  /**
-   * @es_quirk output as a millis number in XPack usage stats, which cannot roundtrip with a Duration as it requires a unit.
-   */
-  min_age?: Duration | long
+  min_age?: Duration
 }
 
 export class Phases {
diff --git a/specification/xpack/usage/types.ts b/specification/xpack/usage/types.ts
index 2e95bf7993..b7c1589268 100644
--- a/specification/xpack/usage/types.ts
+++ b/specification/xpack/usage/types.ts
@@ -17,7 +17,6 @@
  * under the License.
  */
 
-import { Phases } from '@ilm/_types/Phase'
 import { JobStatistics } from '@ml/_types/Job'
 import { Statistics } from '@slm/_types/SnapshotLifecycle'
 import { Dictionary } from '@spec_utils/Dictionary'
@@ -152,6 +151,19 @@ export class HealthStatistics extends Base {
   invocations: Invocations
 }
 
+export class Phase {
+  actions: string[]
+  min_age: DurationValue<UnitMillis>
+}
+
+export class Phases {
+  cold?: Phase
+  delete?: Phase
+  frozen?: Phase
+  hot?: Phase
+  warm?: Phase
+}
+
 export class IlmPolicyStatistics {
   indices_managed: integer
   phases: Phases