a370d5eead
When Joni, the regex engine that powers grok emits a warning it does so by default to System.err. System.err logs are all bucketed together in the server log at WARN level. When Joni emits a warning, it can be extremely verbose, logging a message for each execution again that pattern. For ingest node that means for every document that is run that through Grok. Fortunately, Joni provides a call back hook to push these warnings to a custom location. This commit implements Joni's callback hook to push the Joni warning to the Elasticsearch server logger (logger.org.elasticsearch.ingest.common.GrokProcessor) at debug level. Generally these warning indicate a possible issue with the regular expression and upon creation of the Grok processor will do a "test run" of the expression and log the result (if any) at WARN level. This WARN level log should only occur on pipeline creation which is a much lower frequency then every document. Additionally, the documentation is updated with instructions for how to set the logger to debug level. |
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