Unexpected token – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected character or symbol in the query. This could be due to a syntax error, incorrect formatting, or a misplaced character. To resolve this issue, you should carefully review your query for any syntax errors or misplaced characters. Ensure that all brackets, quotes, and other special characters are correctly placed and paired. Also, check that the query is correctly formatted according to the Elasticsearch query DSL. If the error persists, try simplifying your query to identify the problematic part.

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: metadata, cluster.

Log Context

Log “unexpected token” class name is DataStreamAlias.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  public static DataStreamAlias fromXContent(XContentParser parser) throws IOException {
 XContentParser.Token token = parser.currentToken();
 if (token != XContentParser.Token.FIELD_NAME) {
 throw new ParsingException(parser.getTokenLocation(); "unexpected token");
 String name = parser.currentName();
 return PARSER.parse(parser; name);


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