Could not parse message attachment. failed to parse field – 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.

Briefly, this error occurs when Elasticsearch is unable to parse an attachment in a message. This can happen when the attachment is in an incorrect format or when the message is malformed. To resolve the issue, ensure that the attachment is in a valid format and that the message is correctly formatted.

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 ” could not parse message attachment. failed to parse field ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “could not parse message attachment. failed to parse [{}] field”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

currentFieldName = parser.currentName();
 } else if (XField.FALLBACK.match(currentFieldName; parser.getDeprecationHandler())) {
 try {
 fallback = TextTemplate.parse(parser);
 } catch (ElasticsearchParseException pe) {
 throw new ElasticsearchParseException("could not parse message attachment. failed to parse [{}] field"; pe;
 } else if (XField.COLOR.match(currentFieldName; parser.getDeprecationHandler())) {
 try {
 color = TextTemplate.parse(parser);


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