ESQL: Entirely drop version field (#109169)

This field is no longer supported.

Author: nik9000

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

@@ -46,7 +46,6 @@ final class RequestXContent {
         PARAM_PARSER.declareString(constructorArg(), TYPE);
     }
 
-    static final ParseField ESQL_VERSION_FIELD = new ParseField("version");
     static final ParseField QUERY_FIELD = new ParseField("query");
     private static final ParseField COLUMNAR_FIELD = new ParseField("columnar");
     private static final ParseField FILTER_FIELD = new ParseField("filter");
@@ -73,7 +72,6 @@ static EsqlQueryRequest parseAsync(XContentParser parser) {
     }
 
     private static void objectParserCommon(ObjectParser<EsqlQueryRequest, ?> parser) {
-        parser.declareString((str, consumer) -> {}, ESQL_VERSION_FIELD);
         parser.declareString(EsqlQueryRequest::query, QUERY_FIELD);
         parser.declareBoolean(EsqlQueryRequest::columnar, COLUMNAR_FIELD);
         parser.declareObject(EsqlQueryRequest::filter, (p, c) -> AbstractQueryBuilder.parseTopLevelQuery(p), FILTER_FIELD);

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/action/EsqlQueryRequestTests.java

@@ -149,41 +149,10 @@ public void testRejectUnknownFields() {
             }""", "unknown field [asdf]");
     }
 
-    public void testAnyVersionIsValid() throws IOException {
-        String validVersionString = randomAlphaOfLength(5);
-
-        String json = String.format(Locale.ROOT, """
-            {
-                "version": "%s",
-                "query": "ROW x = 1"
-            }
-            """, validVersionString);
-
-        EsqlQueryRequest request = parseEsqlQueryRequest(json, randomBoolean());
-        assertNull(request.validate());
-
-        request = parseEsqlQueryRequestAsync(json);
-        assertNull(request.validate());
-    }
-
-    public void testMissingVersionIsValid() throws IOException {
-        String missingVersion = randomBoolean() ? "" : ", \"version\": \"\"";
-        String json = String.format(Locale.ROOT, """
-            {
-                "columnar": true,
-                "query": "row x = 1"
-                %s
-            }""", missingVersion);
-
-        EsqlQueryRequest request = parseEsqlQueryRequest(json, randomBoolean());
-        assertNull(request.validate());
-    }
-
     public void testMissingQueryIsNotValid() throws IOException {
         String json = """
             {
-                "columnar": true,
-                "version": "snapshot"
+                "columnar": true
             }""";
         EsqlQueryRequest request = parseEsqlQueryRequest(json, randomBoolean());
         assertNotNull(request.validate());

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/10_basic.yml

@@ -333,3 +333,15 @@ setup:
   - match: {values.0: ["1",2.0,null,true,123,123]}
   - match: {values.1: ["1",2.0,null,true,123,123]}
   - match: {values.2: ["1",2.0,null,true,123,123]}
+
+---
+version is not allowed:
+  - requires:
+      cluster_features: ["gte_v8.14.0"]
+      reason: version allowed in 8.13.latest
+  - do:
+      catch: /unknown field \[version\]/
+      esql.query:
+        body:
+          query: 'from test'
+          version: cat