Could not parse data attachment expected field but found instead – 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 the data attachment due to an unexpected field. This usually happens when the data structure doesn’t match the expected schema. To resolve this issue, you can: 1) Check the data you’re trying to index and ensure it matches the expected schema. 2) Update your mapping to accommodate the unexpected field. 3) If the field is not necessary, you can remove it from the data before indexing.

This guide will help you check for common problems that cause the log ” could not parse data attachment. expected [{}] field but found [{}] instead ” 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 data attachment. expected [{}] field but found [{}] instead” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 String currentFieldName = null;
 while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
 if (token == XContentParser.Token.FIELD_NAME) {
 currentFieldName = parser.currentName();
 } else if (currentFieldName == null) {
 throw new ElasticsearchParseException("could not parse data attachment. expected [{}] field but found [{}] instead";
 Field.FORMAT.getPreferredName(); token);
 } else if (Field.FORMAT.match(currentFieldName; parser.getDeprecationHandler())) {
 if (token == XContentParser.Token.VALUE_STRING) {
 dataAttachment = resolve(parser.text());
 } else {


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