Incorrect format expecting – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch receives data in an incorrect format. It expects data in a JSON object format (enclosed in {}), but it received something different. To resolve this issue, you can: 1) Check the data you’re sending to ensure it’s in the correct JSON format. 2) Validate your JSON data using a JSON validator before sending it to Elasticsearch. 3) If you’re using a script or application to send data, ensure it’s correctly formatting the data as a JSON object.

This guide will help you check for common problems that cause the log ” : incorrect format; expecting {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “: incorrect format; expecting {}” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (startToken >= string.length()) {
 // consumed the string; bail out
 if (token.optional) {
 throw new ParsingException(source; invalidIntervalMessage(string) + ": incorrect format; expecting {}";
 Strings.collectionToDelimitedString(tokens; ""));
 }  // char token
 if ( != 0) {


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