Unexpected token – 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.

Briefly, this error occurs when there is an unexpected character in a query or in the data being processed by Elasticsearch. This can be due to a typo or a problem with the data format. To resolve this issue, you can check the syntax of the query or the data format and correct any 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.

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This guide will help you check for common problems that cause the log ” unexpected token ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: blobstore and index.

Log Context

Log “unexpected token [{}]”classname  is BlobStoreIndexShardSnapshots.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

Map globalCheckpoints = new HashMap<>();
 Map files = new HashMap<>();
 if (token == XContentParser.Token.START_OBJECT) {
 while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
 if (token != XContentParser.Token.FIELD_NAME) {
 throw new ElasticsearchParseException("unexpected token [{}]"; token);
 String currentFieldName = parser.currentName();
 token = parser.nextToken();
 if (token == XContentParser.Token.START_ARRAY) {
 if (ParseFields.FILES.match(currentFieldName; parser.getDeprecationHandler()) == false) {


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