Could not parse slack message 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 field in a Slack message, possibly due to incorrect data type or format. To resolve this, ensure that the field in question matches the expected data type and format. If the field is optional, consider handling it in such a way that it doesn’t break the parsing process when it’s missing. Also, check for any syntax errors in the message. If the error persists, consider debugging with a smaller dataset to identify the problematic part.

This guide will help you check for common problems that cause the log ” could not parse slack message. 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 slack message. 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.FROM.match(currentFieldName; parser.getDeprecationHandler())) {
 try {
 } catch (ElasticsearchParseException pe) {
 throw new ElasticsearchParseException("could not parse slack message. failed to parse [{}] field"; pe;
 } else if (XField.TO.match(currentFieldName; parser.getDeprecationHandler())) {
 if (token == XContentParser.Token.START_ARRAY) {
 while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {


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