Add control for array size

Author: drempapis

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

@@ -17,6 +17,7 @@
 import org.elasticsearch.common.xcontent.XContentHelper;
 import org.elasticsearch.core.Nullable;
 import org.elasticsearch.features.NodeFeature;
+import org.elasticsearch.index.IndexSettings;
 import org.elasticsearch.index.IndexVersion;
 import org.elasticsearch.index.IndexVersions;
 import org.elasticsearch.index.fielddata.FieldDataContext;
@@ -749,8 +750,14 @@ private static void parseNonDynamicArray(
         XContentParser.Token token;
         XContentParser.Token previousToken = parser.currentToken();
         int elements = 0;
+        int countArray = 0;
+        long nestedDocsLimit = context.indexSettings().getMappingNestedDocsLimit();
         while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
             if (token == XContentParser.Token.START_OBJECT) {
+                if(countArray++ >= nestedDocsLimit) {
+                    throw new IllegalStateException("Limit [" + nestedDocsLimit + "] of elements in an array field [" + lastFieldName + "] " +
+                        "has been exceeded");
+                }
                 elements = 2;
                 parseObject(context, lastFieldName);
             } else if (token == XContentParser.Token.START_ARRAY) {