Could not parse dynamic attachments expected a string value for field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch tries to parse dynamic attachments and expects a string value for a certain field, but doesn’t find it. This could be due to incorrect data types or malformed data. To resolve this issue, ensure that the field in question is correctly mapped as a string in your index mapping. Also, check the data you’re trying to index to make sure it’s correctly formatted and that the field in question is indeed a string. If necessary, you may need to preprocess your data to convert this field to a string before indexing.

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This guide will help you check for common problems that cause the log ” could not parse dynamic attachments. expected a string value for [{}] 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 dynamic attachments. expected a string value for [{}] 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.LIST_PATH.match(currentFieldName; parser.getDeprecationHandler())) {
 if (token == XContentParser.Token.VALUE_STRING) {
 listPath = parser.text();
 } else {
 throw new ElasticsearchParseException("could not parse dynamic attachments. expected a string value for [{}] field; " +
 "but found [{}]"; XField.LIST_PATH.getPreferredName(); token);
 } else if (XField.TEMPLATE.match(currentFieldName; parser.getDeprecationHandler())) {
 try {
 template = Attachment.Template.parse(parser);


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