ES|QL: Disallow brackets in unquoted index patterns

docs/changelog/130427.yaml

@@ -0,0 +1,5 @@
+pr: 130427
+summary: Disallow brackets in unquoted index pattersn
+area: ES|QL
+type: bug
+issues: []

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

@@ -252,7 +252,12 @@ showCommand
     ;
 
 enrichCommand
-    : ENRICH policyName=ENRICH_POLICY_NAME (ON matchField=qualifiedNamePattern)? (WITH enrichWithClause (COMMA enrichWithClause)*)?
+    : ENRICH policyName=enrichPolicyName (ON matchField=qualifiedNamePattern)? (WITH enrichWithClause (COMMA enrichWithClause)*)?
+    ;
+
+enrichPolicyName
+    : ENRICH_POLICY_NAME
+    | QUOTED_STRING
     ;
 
 enrichWithClause

x-pack/plugin/esql/src/main/antlr/lexer/Enrich.g4

@@ -24,7 +24,7 @@ ENRICH_WITH : WITH -> type(WITH), pushMode(ENRICH_FIELD_MODE);
 // similar to that of an index
 // see https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-create-index.html#indices-create-api-path-params
 fragment ENRICH_POLICY_NAME_BODY
-    : ~[\\/?"<>| ,#\t\r\n:]
+    : ~[\\/?"<>| ,#\t\r\n:()]
     ;
 
 ENRICH_POLICY_NAME
@@ -36,6 +36,8 @@ ENRICH_MODE_UNQUOTED_VALUE
     : ENRICH_POLICY_NAME -> type(ENRICH_POLICY_NAME)
     ;
 
+ENRICH_QUOTED_POLICY_NAME : QUOTED_STRING -> type(QUOTED_STRING);
+
 ENRICH_LINE_COMMENT
     : LINE_COMMENT -> channel(HIDDEN)
     ;

x-pack/plugin/esql/src/main/antlr/lexer/From.g4

@@ -29,7 +29,7 @@ FROM_RP : RP -> type(RP), popMode;
 // in 8.14 ` were not allowed
 // this has been relaxed in 8.15 since " is used for quoting
 fragment UNQUOTED_SOURCE_PART
-    : ~[:"=|,[\]/ \t\r\n]
+    : ~[:"=|,[\]/() \t\r\n]
     | '/' ~[*/] // allow single / but not followed by another / or * which would start a comment -- used in index pattern date spec
     ;
 

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

@@ -1232,7 +1232,13 @@ public enum Cap {
         /**
          * Support avg with aggregate metric doubles
          */
-        AGGREGATE_METRIC_DOUBLE_AVG(AGGREGATE_METRIC_DOUBLE_FEATURE_FLAG);
+        AGGREGATE_METRIC_DOUBLE_AVG(AGGREGATE_METRIC_DOUBLE_FEATURE_FLAG),
+
+        /**
+         * Forbid usage of brackets in unquoted index and enrich policy names
+         * https://github.com/elastic/elasticsearch/issues/130378
+         */
+        NO_BRACKETS_IN_UNQUOTED_INDEX_NAMES;
 
         private final boolean enabled;