Failed to parse index option – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.1

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Briefly, this error occurs when Elasticsearch fails to parse the index option due to incorrect or invalid syntax. This could be due to a missing or wrongly formatted parameter in the index settings. To resolve this issue, you should first check the index settings for any syntax errors or missing parameters. If the problem persists, try to recreate the index with the correct settings. Also, ensure that the Elasticsearch version you are using supports the index options you are trying to use.

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This guide will help you check for common problems that cause the log ” failed to parse index option [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “failed to parse index option [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else if (INDEX_OPTIONS_FREQS.equalsIgnoreCase(value)) {
 return IndexOptions.DOCS_AND_FREQS;
 } else if (INDEX_OPTIONS_DOCS.equalsIgnoreCase(value)) {
 return IndexOptions.DOCS;
 } else {
 throw new ElasticsearchParseException("failed to parse index option [{}]"; value);
 }  public static DateFormatter parseDateTimeFormatter(Object node) {
 if (node instanceof String) {


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