Start object expected INDEX METADATA IDENTIFIERS – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.9-7.9

Briefly, this error occurs when Elasticsearch expects a start object but doesn’t find one. This is usually due to a malformed request or incorrect data format. To resolve this, ensure that your request is correctly formatted, typically as a JSON object. Also, check that the INDEX_METADATA_IDENTIFIERS are correctly defined and used. If you’re using a client library to interact with Elasticsearch, ensure it’s up-to-date and compatible with your Elasticsearch version.

This guide will help you check for common problems that cause the log ” start object expected [” + INDEX_METADATA_IDENTIFIERS + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories.

Log Context

Log “start object expected [” + INDEX_METADATA_IDENTIFIERS + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else if (INDEX_METADATA_IDENTIFIERS.equals(field)) {
 if (parser.nextToken() != XContentParser.Token.START_OBJECT) {
 throw new ElasticsearchParseException("start object expected [" + INDEX_METADATA_IDENTIFIERS + "]");
 } else if (MIN_VERSION.equals(field)) {
 if (parser.nextToken() != XContentParser.Token.VALUE_STRING) {
 throw new ElasticsearchParseException("version string expected [min_version]");


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