elastic
diff --git a/‎x-pack/plugin/esql/src/main/antlr/EsqlBaseParser.g4‎
Lines changed: 1 addition & 0 deletions b/‎x-pack/plugin/esql/src/main/antlr/EsqlBaseParser.g4‎
Lines changed: 1 addition & 0 deletions
@@ -143,6 +143,7 @@ indexPattern
 
 clusterString
     : UNQUOTED_SOURCE
+    | QUOTED_STRING
     ;
 
 indexString
Original file line number	Diff line number	Diff line change
`@@ -143,6 +143,7 @@ indexPattern`
`143`	`143`
`144`	`144`	`clusterString`
`145`	`145`	`: UNQUOTED_SOURCE`
	`146`	`+ \| QUOTED_STRING`
`146`	`147`	`;`
`147`	`148`
`148`	`149`	`indexString`