Unknown Similarity type ” + value + ” for field ” + name + ” – 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 Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Unknown Similarity type ” + value + ” for field ” + name + ” ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Unknown Similarity type [” + value + “] for field [” + name + “]”classname  is TypeParsers.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 public static SimilarityProvider resolveSimilarity(Mapper.TypeParser.ParserContext parserContext; String name; String value) {
 SimilarityProvider similarityProvider = parserContext.getSimilarity(value);
 if (similarityProvider == null) {
 throw new MapperParsingException("Unknown Similarity type [" + value + "] for field [" + name + "]");
 return similarityProvider;


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