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Rollout/Adoption Plan

• This change does introduce a change to log format, but the indexing will seamlessly handle older log blocks which were written without this by computing the bloom filters, min, max from actual data.
• One thing worth calling out is that : as users pick up this change there might be a slowdown due to the approach above, since a lot of avro data is being full read out. but once sufficient compactions run, the overhead will approach zero and index lookup should perform equivalent to how base file index lookup.
• Once the log indexing is deemed stable in the next 1-2 releases, we will eventually get rid of all code paths that special case based on index.canIndexLogFiles() 

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