We are using Rally to do performance benchmarking on our ELK stacks. For this we want to use our own data (like apm events) to ingest to elastic and measure index performance.
There are a few enhancement requests in this area e.g. making it easier for Rally to use existing data for benchmarks and to be able to generate load based on the slowlog (which can log most traffic if threshold is set low enough). Please add comments and a +1 if any of these approaches would work for you.
As it stands now I do not think there is any official way to generate test data and track configuration for existing indices.
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