[9.0] Refine ESQL docs handling of applies_to (#125835)

docs/reference/query-languages/esql/esql-commands.md

@@ -666,10 +666,6 @@ FROM employees
 ## `LOOKUP JOIN` [esql-lookup-join]
 
 ::::{warning}
-```{applies_to}
-stack: preview 9.0, coming 9.1
-serverless: preview
-```
 This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.
 ::::
 
@@ -753,10 +749,6 @@ FROM Left
 ## `MV_EXPAND` [esql-mv_expand]
 
 ::::{warning}
-```{applies_to}
-stack: preview 9.0, coming 9.1
-serverless: preview
-```
 This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.
 ::::
 

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/FunctionAppliesTo.java

@@ -17,4 +17,6 @@
     String version() default "";
 
     String description() default "";
+
+    boolean serverless() default true;
 }

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/FunctionAppliesToLifecycle.java

@@ -8,12 +8,22 @@
 package org.elasticsearch.xpack.esql.expression.function;
 
 public enum FunctionAppliesToLifecycle {
-    PREVIEW,
-    BETA,
-    DEVELOPMENT,
-    DEPRECATED,
-    COMING,
-    DISCONTINUED,
-    UNAVAILABLE,
-    GA
+    PREVIEW(true),
+    BETA(false),
+    DEVELOPMENT(false),
+    DEPRECATED(true),
+    COMING(true),
+    DISCONTINUED(false),
+    UNAVAILABLE(false),
+    GA(true);
+
+    private final boolean serverless;
+
+    FunctionAppliesToLifecycle(boolean serverless) {
+        this.serverless = serverless;
+    }
+
+    public FunctionAppliesToLifecycle serverlessLifecycle() {
+        return serverless ? GA : this;
+    }
 }

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/aggregate/Values.java

@@ -23,8 +23,6 @@
 import org.elasticsearch.xpack.esql.core.tree.Source;
 import org.elasticsearch.xpack.esql.core.type.DataType;
 import org.elasticsearch.xpack.esql.expression.function.Example;
-import org.elasticsearch.xpack.esql.expression.function.FunctionAppliesTo;
-import org.elasticsearch.xpack.esql.expression.function.FunctionAppliesToLifecycle;
 import org.elasticsearch.xpack.esql.expression.function.FunctionInfo;
 import org.elasticsearch.xpack.esql.expression.function.FunctionType;
 import org.elasticsearch.xpack.esql.expression.function.Param;
@@ -86,8 +84,7 @@ public class Values extends AggregateFunction implements ToAggregator {
             a [Circuit Breaker Error](docs-content://troubleshoot/elasticsearch/circuit-breaker-errors.md).
             ::::""",
         type = FunctionType.AGGREGATE,
-        examples = @Example(file = "string", tag = "values-grouped"),
-        appliesTo = { @FunctionAppliesTo(lifeCycle = FunctionAppliesToLifecycle.PREVIEW) }
+        examples = @Example(file = "string", tag = "values-grouped")
     )
     public Values(
         Source source,

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/fulltext/Match.java

@@ -162,8 +162,7 @@ public class Match extends FullTextFunction implements OptionalArgument, PostOpt
         appliesTo = {
             @FunctionAppliesTo(
                 lifeCycle = FunctionAppliesToLifecycle.COMING,
-                version = "9.1.0",
-                description = "Support for optional named parameters is only available from 9.1.0"
+                description = "Support for optional named parameters is only available in serverless, or in a future {{es}} release"
             ) }
     )
     public Match(

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/fulltext/QueryString.java

@@ -122,8 +122,7 @@ public class QueryString extends FullTextFunction implements OptionalArgument {
         appliesTo = {
             @FunctionAppliesTo(
                 lifeCycle = FunctionAppliesToLifecycle.COMING,
-                version = "9.1.0",
-                description = "Support for optional named parameters is only available from 9.1.0"
+                description = "Support for optional named parameters is only available in serverless, or in a future {{es}} release"
             ) }
     )
     public QueryString(