Unknown field found – 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 field found ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: Node.

Log Context

Log “unknown field found”classname  is XContentParserUtils.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

throw new ParsingException(parser.getTokenLocation(); String.format(Locale.ROOT; message; fieldName; currentName));
 * @throws ParsingException with a "unknown field found" reason
 public static void throwUnknownField(String field; XContentLocation location) {
 String message = "Failed to parse object: unknown field [%s] found";
 throw new ParsingException(location; String.format(Locale.ROOT; message; field));


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