Could not parse message attachment failed to parse field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch is unable to parse a specific field in the message attachment. This could be due to incorrect data format, a mismatch between the data type and the field type, or a malformed JSON. To resolve this issue, you can: 1) Check the data format and ensure it matches the expected format. 2) Verify the field type in your Elasticsearch mapping and ensure it matches the data type. 3) Validate your JSON to ensure it’s correctly formatted.

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” class name 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);