[8.16] [ES|QL] Make named parameter for identifier and pattern available only under snapshot (#114784)

docs/changelog/114784.yaml

@@ -0,0 +1,5 @@
+pr: 114784
+summary: "[ES|QL] make named parameter for identifier and pattern snapshot"
+area: ES|QL
+type: bug
+issues: []

x-pack/plugin/esql/qa/server/src/main/java/org/elasticsearch/xpack/esql/qa/rest/RestEsqlTestCase.java

@@ -32,6 +32,7 @@
 import org.elasticsearch.xcontent.XContentBuilder;
 import org.elasticsearch.xcontent.XContentType;
 import org.elasticsearch.xpack.esql.EsqlTestUtils;
+import org.elasticsearch.xpack.esql.action.EsqlCapabilities;
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
@@ -670,6 +671,10 @@ public void testErrorMessageForArrayValuesInParams() throws IOException {
     }
 
     public void testNamedParamsForIdentifierAndIdentifierPatterns() throws IOException {
+        assumeTrue(
+            "named parameters for identifiers and patterns require snapshot build",
+            EsqlCapabilities.Cap.NAMED_PARAMETER_FOR_FIELD_AND_FUNCTION_NAMES.isEnabled()
+        );
         bulkLoadTestData(10);
         // positive
         var query = requestObjectBuilder().query(

x-pack/plugin/esql/src/main/antlr/EsqlBaseLexer.g4

@@ -305,8 +305,8 @@ mode PROJECT_MODE;
 PROJECT_PIPE : PIPE -> type(PIPE), popMode;
 PROJECT_DOT: DOT -> type(DOT);
 PROJECT_COMMA : COMMA -> type(COMMA);
-PROJECT_PARAM : PARAM -> type(PARAM);
-PROJECT_NAMED_OR_POSITIONAL_PARAM : NAMED_OR_POSITIONAL_PARAM -> type(NAMED_OR_POSITIONAL_PARAM);
+PROJECT_PARAM : {this.isDevVersion()}? PARAM -> type(PARAM);
+PROJECT_NAMED_OR_POSITIONAL_PARAM : {this.isDevVersion()}? NAMED_OR_POSITIONAL_PARAM -> type(NAMED_OR_POSITIONAL_PARAM);
 
 fragment UNQUOTED_ID_BODY_WITH_PATTERN
     : (LETTER | DIGIT | UNDERSCORE | ASTERISK)
@@ -340,8 +340,8 @@ RENAME_PIPE : PIPE -> type(PIPE), popMode;
 RENAME_ASSIGN : ASSIGN -> type(ASSIGN);
 RENAME_COMMA : COMMA -> type(COMMA);
 RENAME_DOT: DOT -> type(DOT);
-RENAME_PARAM : PARAM -> type(PARAM);
-RENAME_NAMED_OR_POSITIONAL_PARAM : NAMED_OR_POSITIONAL_PARAM -> type(NAMED_OR_POSITIONAL_PARAM);
+RENAME_PARAM : {this.isDevVersion()}? PARAM -> type(PARAM);
+RENAME_NAMED_OR_POSITIONAL_PARAM : {this.isDevVersion()}? NAMED_OR_POSITIONAL_PARAM -> type(NAMED_OR_POSITIONAL_PARAM);
 
 AS : 'as';
 
@@ -413,8 +413,8 @@ ENRICH_FIELD_QUOTED_IDENTIFIER
     : QUOTED_IDENTIFIER -> type(QUOTED_IDENTIFIER)
     ;
 
-ENRICH_FIELD_PARAM : PARAM -> type(PARAM);
-ENRICH_FIELD_NAMED_OR_POSITIONAL_PARAM : NAMED_OR_POSITIONAL_PARAM -> type(NAMED_OR_POSITIONAL_PARAM);
+ENRICH_FIELD_PARAM : {this.isDevVersion()}? PARAM -> type(PARAM);
+ENRICH_FIELD_NAMED_OR_POSITIONAL_PARAM : {this.isDevVersion()}? NAMED_OR_POSITIONAL_PARAM -> type(NAMED_OR_POSITIONAL_PARAM);
 
 ENRICH_FIELD_LINE_COMMENT
     : LINE_COMMENT -> channel(HIDDEN)
@@ -431,8 +431,8 @@ ENRICH_FIELD_WS
 mode MVEXPAND_MODE;
 MVEXPAND_PIPE : PIPE -> type(PIPE), popMode;
 MVEXPAND_DOT: DOT -> type(DOT);
-MVEXPAND_PARAM : PARAM -> type(PARAM);
-MVEXPAND_NAMED_OR_POSITIONAL_PARAM : NAMED_OR_POSITIONAL_PARAM -> type(NAMED_OR_POSITIONAL_PARAM);
+MVEXPAND_PARAM : {this.isDevVersion()}? PARAM -> type(PARAM);
+MVEXPAND_NAMED_OR_POSITIONAL_PARAM : {this.isDevVersion()}? NAMED_OR_POSITIONAL_PARAM -> type(NAMED_OR_POSITIONAL_PARAM);
 
 MVEXPAND_QUOTED_IDENTIFIER
     : QUOTED_IDENTIFIER -> type(QUOTED_IDENTIFIER)

x-pack/plugin/esql/src/main/antlr/EsqlBaseParser.g4

@@ -195,7 +195,7 @@ identifier
 
 identifierPattern
     : ID_PATTERN
-    | parameter
+    | {this.isDevVersion()}? parameter
     ;
 
 constant
@@ -218,7 +218,7 @@ parameter
 
 identifierOrParameter
     : identifier
-    | parameter
+    | {this.isDevVersion()}? parameter
     ;
 
 limitCommand

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/EsqlCapabilities.java

@@ -375,7 +375,7 @@ public enum Cap {
         /**
          * Support named parameters for field names.
          */
-        NAMED_PARAMETER_FOR_FIELD_AND_FUNCTION_NAMES,
+        NAMED_PARAMETER_FOR_FIELD_AND_FUNCTION_NAMES(true),
 
         /**
          * Fix sorting not allowed on _source and counters.

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/RequestXContent.java

@@ -184,7 +184,8 @@ private static QueryParams parseParams(XContentParser p) throws IOException {
                         String paramName = entry.getKey();
                         checkParamNameValidity(paramName, errors, loc);
 
-                        if (entry.getValue() instanceof Map<?, ?> values) {// parameter specified as key:value pairs
+                        if (EsqlCapabilities.Cap.NAMED_PARAMETER_FOR_FIELD_AND_FUNCTION_NAMES.isEnabled()
+                            && entry.getValue() instanceof Map<?, ?> values) {// parameter specified as key:value pairs
                             Map<ParamParsingKey, Object> paramElements = Maps.newMapWithExpectedSize(2);
                             for (Object keyName : values.keySet()) {
                                 ParamParsingKey paramType = checkParamValueKeysValidity(keyName.toString(), errors, loc);