Move the mapping update to a new index created upfront (#132581)

Author: astefan

muted-tests.yml

@@ -527,9 +527,6 @@ tests:
 - class: org.elasticsearch.xpack.esql.qa.single_node.EsqlSpecIT
   method: test {csv-spec:spatial.ConvertFromStringParseError}
   issue: https://github.com/elastic/elasticsearch/issues/132558
-- class: org.elasticsearch.xpack.esql.qa.mixed.EsqlClientYamlIT
-  method: test {p0=esql/40_unsupported_types/nested declared inline}
-  issue: https://github.com/elastic/elasticsearch/issues/126606
 
 # Examples:
 #

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/40_unsupported_types.yml

@@ -108,6 +108,35 @@ setup:
             "some_doc": { "foo": "xy", "bar": 12 }
           }
 
+  - do:
+      indices.create:
+        index: test2
+        body:
+          settings:
+            number_of_shards: 5
+          mappings:
+            properties:
+              name:
+                type: keyword
+              nested:
+                type: nested
+              find_me:
+                type: long
+
+  - do:
+      bulk:
+        index: test2
+        refresh: true
+        body:
+          - { "index": { } }
+          - {
+            "find_me": 1,
+            "nested": {
+              "foo": 1,
+              "bar": "bar",
+              "baz": 1.9
+            }
+          }
 ---
 unsupported:
   - requires:
@@ -417,28 +446,13 @@ unsupported with sort:
   - match: { values.0.28: 3 }
 ---
 nested declared inline:
-  - do:
-      bulk:
-        index: test
-        refresh: true
-        body:
-          - { "index": { } }
-          - {
-            "find_me": 1,
-            "nested": {
-              "foo": 1,
-              "bar": "bar",
-              "baz": 1.9
-            }
-          }
-
   - do:
       allowed_warnings_regex:
         - "Field \\[.*\\] cannot be retrieved, it is unsupported or not indexed; returning null"
         - "No limit defined, adding default limit of \\[.*\\]"
       esql.query:
         body:
-          query: 'FROM test | WHERE find_me == 1 | KEEP n*'
+          query: 'FROM test2 | WHERE find_me == 1 | KEEP n*'
 
   # The `nested` field is not visible, nor are any of it's subfields.
   - match: { columns: [{name: name, type: keyword}] }