Both need the requiredSize, shardSize, minDocCount and shardMinDocCount.
Parsing should not be duplicated.

…unt a single parameter

every class using these parameters has their own member where these four
are stored. This clutters the code. Because they mostly needed together
it might make sense to group them.
I hope that this makes the code more readable and also that if avoids
errors such as mixing up the int/long parameters in the future.

This was discussed in issue elastic#6041 and elastic#5998 .

squash to commit "refactor: make requiredSize, shardSize, minDocCount and shardMinDocCount a single parameter"

squash to commit "refactor: make requiredSize, shardSize, minDocCount and shardMinDocCount a single parameter"

…de to BucketCountThresholds