Failed to find format – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is unable to locate the specified format. This could be due to a typo in the format name, the format not being installed, or the format not being supported in the current version of Elasticsearch. To resolve this issue, you can verify the format name, ensure the format is installed, or check if the format is supported in your Elasticsearch version. If the format is not supported, you may need to upgrade your Elasticsearch version or find an alternative format that is supported.

This guide will help you check for common problems that cause the log ” failed to find format [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: fielddata and index.

Log Context

Log “failed to find format [” classname is IndexFieldDataService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             format = null;
        }
        if (format != null) {
            builder = buildersByTypeAndFormat.get(Tuple.tuple(type.getType(); format));
            if (builder == null) {
                logger.warn("failed to find format [" + format + "] for field [" + fieldNames.fullName() + "]; will use default");
            }
        }
        if (builder == null && docValues) {
            builder = docValuesBuildersByType.get(type.getType());
        }




 

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