Add textRefOrNull() override to MultiFieldParser

Author: jordan-powers

server/src/main/java/org/elasticsearch/index/mapper/CompletionFieldMapper.java

@@ -30,6 +30,7 @@
 import org.elasticsearch.search.suggest.completion.context.ContextMapping;
 import org.elasticsearch.search.suggest.completion.context.ContextMappings;
 import org.elasticsearch.xcontent.DeprecationHandler;
+import org.elasticsearch.xcontent.ESBytesRef;
 import org.elasticsearch.xcontent.FilterXContentParser;
 import org.elasticsearch.xcontent.NamedXContentRegistry;
 import org.elasticsearch.xcontent.ToXContent;
@@ -707,6 +708,14 @@ public Token currentToken() {
             return super.currentToken();
         }
 
+        @Override
+        public ESBytesRef textRefOrNull() throws IOException {
+            if (parsingObject == false) {
+                return null;
+            }
+            return super.textRefOrNull();
+        }
+
         @Override
         public String textOrNull() throws IOException {
             if (parsingObject == false) {