GEODE-4745: Stat check asserts modified

[nabarunnag]

* The assert check for the lucene commit checks have been modified to address the fact that it is not deterministic
* The reindex thread may be faster than the puts being done by the test hence the number of commits may different depending on whether the puts were faster or the reindexing thread.

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[jhuynh1]

I think this makes sense based on how it's designed today