Expected START_OBJECT as the token but was – How to solve this Elasticsearch error

Opster Team

March-22, 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 ” expected START_OBJECT as the token but was ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “expected START_OBJECT as the token but was”classname  is IndicesOptions.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

Boolean ignoreUnavailable = defaults == null ? null : defaults.ignoreUnavailable();
 boolean ignoreThrottled = defaults == null ? false : defaults.ignoreThrottled();
 Token token = parser.currentToken() == Token.START_OBJECT ? parser.currentToken() : parser.nextToken();
 String currentFieldName = null;
 if (token != Token.START_OBJECT) {
 throw new ElasticsearchParseException("expected START_OBJECT as the token but was " + token);
 while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
 if (token == XContentParser.Token.FIELD_NAME) {
 currentFieldName = parser.currentName();
 } else if (token == Token.START_ARRAY) {


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