Explore Relevance Based Performance Benchmarks [LUCENE-8841]

While discussing improvements in relevance of fuzzy queries with @jimczi, the topic of how to measure impact of changes to relevance of common queries came up. While a non trivial effort, having such a benchmark will allow us to measure the impact of potential changes and also catch regressions well in time.

This Jira tracks ideas and efforts in that direction

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Migrated from [LUCENE-8841](https://issues.apache.org/jira/browse/LUCENE-8841) by Atri Sharma (@atris), updated Jun 08 2019

Start by reviewing the migrated issue and its linked LUCENE-8841 Jira discussion, focusing on the proposed relevance benchmarks for fuzzy and other common queries. Define the benchmark scope and success criteria from that discussion; done means relevance changes can be measured and regressions can be detected in time.

Written by the indexing model from the issue text.