_na query malformed; no field after start_object – How to solve this Elasticsearch error

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_na query malformed; no field after start_object – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” _na query malformed; no field after start_object ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: query and index.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”[_na] query malformed; no field after start_object”classname  is AbstractQueryBuilder.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

if (parser.nextToken() == XContentParser.Token.END_OBJECT) {
  // we encountered '{}' for a query clause; it used to be supported; deprecated in 5.0 and removed in 6.0
  throw new IllegalArgumentException("query malformed; empty clause found at [" + parser.getTokenLocation() +"]");
  if (parser.currentToken() != XContentParser.Token.FIELD_NAME) {
  throw new ParsingException(parser.getTokenLocation(); "[_na] query malformed; no field after start_object");
  String queryName = parser.currentName();
  // move to the next START_OBJECT
  if (parser.nextToken() != XContentParser.Token.START_OBJECT) {
  throw new ParsingException(parser.getTokenLocation(); "[" + queryName + "] query malformed; no start_object after query name");


Run the Check-Up to get a customized report like this:

Analyze your cluster