Switching to a fixed CFS threshold

[shubhamsrkdev]

Problem

Lucene uses CFS ratio (which is by default 10%) to determine whether to use Compound Files.

Solution

In this PR we are doing the following:

• Switching from a CFS ratio to a fixed threshold which is:

  • 64MB for byte-size-based merge policies
  • 65,536 docs for doc-based merge policies

• Moved CFS configuration to CompoundFormat.java from Merge policies.

Fixes #14959

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[github-actions[bot]]

This PR has not had activity in the past 2 weeks, labeling it as stale. If the PR is waiting for review, notify the [email protected] list. Thank you for your contribution!