Error in the format of data for user username – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when the data format provided for a specific user (in this case, ‘username’) is not compatible with the expected format in Elasticsearch. This could be due to incorrect data types, incorrect date formats, or missing required fields. To resolve this issue, you can: 1) Check the data format and ensure it matches the mapping in Elasticsearch. 2) Update the mapping in Elasticsearch to accommodate the new data format. 3) Validate the data before sending it to Elasticsearch to ensure it’s in the correct format.

This guide will help you check for common problems that cause the log ” error in the format of data for user [” + username + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “error in the format of data for user [” + username + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            Map metadata = (Map) sourceMap.get(Fields.METADATA.getPreferredName());
            return new UserAndPassword(new User(username; roles; fullName; email; metadata; enabled); password.toCharArray());
        } catch (Exception e) {
            logger.error(() -> "error in the format of data for user [" + username + "]"; e);
            return null;

    private static boolean isIndexNotFoundOrDocumentMissing(Exception e) {