Unknown parameter – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.13

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Briefly, this error occurs when Elasticsearch receives a request with an unrecognized parameter. This could be due to a typo in the parameter name, or using a parameter that is not supported in the current version of Elasticsearch. To resolve this issue, you should first check the spelling and syntax of your parameters. If they are correct, verify that the parameters are supported in your version of Elasticsearch. If the parameters are deprecated, you will need to find and use the updated equivalents.

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

Log Context

Log “unknown parameter [{}]” class name is BlobStoreIndexShardSnapshot.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else if (META_HASH.equals(currentFieldName)) {
 metaHash.bytes = parser.binaryValue();
 metaHash.offset = 0;
 metaHash.length = metaHash.bytes.length;
 } else {
 throw new ElasticsearchParseException("unknown parameter [{}]"; currentFieldName);
 } else {
 throw new ElasticsearchParseException("unexpected token  [{}]"; token);
 } else {


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