This article is available on Elastic’s blog as a 3-part series. Please check it out at the following URLs: https://www.elastic.co/blog/structuring-elasticsearch-data-with-grok-on-ingest-for-faster-analytics https://www.elastic.co/blog/slow-and-steady-how-to-build-custom-grok-patterns-incrementally https://www.elastic.co/blog/debugging-broken-grok-expressions-in-elasticsearch-ingest-processors