Regexp query – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.3-8.9

Briefly, this error occurs when there is a problem with the regular expression (regex) used in a regexp query in Elasticsearch. The issue could be due to an invalid or unsupported regex pattern. To resolve this, ensure that the regex pattern is valid and supported by Elasticsearch. Also, check that the field you’re querying is of type ‘text’ or ‘keyword’. If the field is not of these types, consider changing its mapping or use a different query. Lastly, ensure that the regex does not exceed the max_determinized_states limit set in Elasticsearch.

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

Log Context

Log “regexp query” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 int matchFlags;
 int maxDeterminizedStates;
 @Nullable MultiTermQuery.RewriteMethod method;
 SearchExecutionContext context
 ) {
 throw new QueryShardException(context; fail("regexp query"));
 }  @Override
 public Query phraseQuery(TokenStream stream; int slop; boolean enablePositionIncrements; SearchExecutionContext context) {
 throw new QueryShardException(context; fail("phrase query"));


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