RegexpQueryParser takes a String as value like its Builder

Relates #11896
Closes #12200

Author: alexksikes

core/src/main/java/org/elasticsearch/index/mapper/MappedFieldType.java

@@ -468,7 +468,7 @@ public Query prefixQuery(Object value, @Nullable MultiTermQuery.RewriteMethod me
         return query;
     }
 
-    public Query regexpQuery(Object value, int flags, int maxDeterminizedStates, @Nullable MultiTermQuery.RewriteMethod method, @Nullable QueryParseContext context) {
+    public Query regexpQuery(String value, int flags, int maxDeterminizedStates, @Nullable MultiTermQuery.RewriteMethod method, @Nullable QueryParseContext context) {
         RegexpQuery query = new RegexpQuery(createTerm(value), flags, maxDeterminizedStates);
         if (method != null) {
             query.setRewriteMethod(method);

core/src/main/java/org/elasticsearch/index/mapper/internal/IdFieldMapper.java

@@ -201,7 +201,7 @@ public Query prefixQuery(Object value, @Nullable MultiTermQuery.RewriteMethod me
         }
 
         @Override
-        public Query regexpQuery(Object value, int flags, int maxDeterminizedStates, @Nullable MultiTermQuery.RewriteMethod method, @Nullable QueryParseContext context) {
+        public Query regexpQuery(String value, int flags, int maxDeterminizedStates, @Nullable MultiTermQuery.RewriteMethod method, @Nullable QueryParseContext context) {
             if (indexOptions() != IndexOptions.NONE || context == null) {
                 return super.regexpQuery(value, flags, maxDeterminizedStates, method, context);
             }

core/src/main/java/org/elasticsearch/index/query/RegexpQueryParser.java

@@ -57,7 +57,7 @@ public Query parse(QueryParseContext parseContext) throws IOException, QueryPars
         String fieldName = parser.currentName();
         String rewriteMethod = null;
 
-        Object value = null;
+        String value = null;
         float boost = 1.0f;
         int flagsValue = DEFAULT_FLAGS_VALUE;
         int maxDeterminizedStates = Operations.DEFAULT_MAX_DETERMINIZED_STATES;
@@ -76,7 +76,7 @@ public Query parse(QueryParseContext parseContext) throws IOException, QueryPars
                         currentFieldName = parser.currentName();
                     } else {
                         if ("value".equals(currentFieldName)) {
-                            value = parser.objectBytes();
+                            value = parser.textOrNull();
                         } else if ("boost".equals(currentFieldName)) {
                             boost = parser.floatValue();
                         } else if ("rewrite".equals(currentFieldName)) {
@@ -100,7 +100,7 @@ public Query parse(QueryParseContext parseContext) throws IOException, QueryPars
                     queryName = parser.text();
                 } else {
                     fieldName = currentFieldName;
-                    value = parser.objectBytes();
+                    value = parser.textOrNull();
                 }
             }
         }