_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 analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” _na query malformed; no field after start_object ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query and index.


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");

 

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