Unknown parameter – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

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: blobstore and index.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “unknown parameter [{}]”classname  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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