Expected values within array for – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.1-7.15

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Briefly, this error occurs when Elasticsearch expects an array of values but doesn’t find them in the expected format. This could be due to incorrect data structure or syntax. To resolve this, ensure that the data being sent matches the expected array format. Check your JSON structure and ensure that the array values are correctly enclosed in square brackets. Also, validate your JSON data to ensure there are no syntax errors. If the error persists, review your Elasticsearch mapping to ensure it aligns with the data being indexed.

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

Log Context

Log “expected values within array for” class name is IndicesOptions.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 wildcardStates = EnumSet.noneOf(WildcardStates.class);
 while ((token = parser.nextToken()) != Token.END_ARRAY) {
 if (token.isValue()) {
 WildcardStates.updateSetForValue(wildcardStates; parser.text());
 } else {
 throw new ElasticsearchParseException("expected values within array for " +
 } else {
 throw new ElasticsearchParseException("already parsed expand_wildcards");


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