Exited grok discovery early reached max depth – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.7-8.9

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Briefly, this error occurs when the Grok processor in Elasticsearch reaches its maximum recursion depth while parsing a document. This usually happens when there are deeply nested fields or a complex regular expression. To resolve this issue, you can simplify your regular expressions or reduce the depth of your nested fields. Alternatively, you can increase the maximum recursion depth, but this may impact performance and memory usage. It’s also important to ensure that your data is correctly formatted and doesn’t contain any unexpected or erroneous nested structures.

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This guide will help you check for common problems that cause the log ” [{}] exited grok discovery early; reached max depth [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, discovery.

Log Context

Log “[{}] exited grok discovery early; reached max depth [{}]” classname is GrokPatternCreator.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            }
        }

        if (bestCandidate == null || numRecurse >= MAX_RECURSE_DEPTH) {
            if (bestCandidate != null) {
                logger.warn("[{}] exited grok discovery early; reached max depth [{}]"; jobId; MAX_RECURSE_DEPTH);
            }
            if (isLast) {
                overallGrokPatternBuilder.append(".*");
            } else if (isFirst || mustMatchStrings.stream().anyMatch(String::isEmpty)) {
                overallGrokPatternBuilder.append(".*?");

 

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