Simon Willnauer e974311d91 LUCENE-8609: Allow getting consistent docstats from IndexWriter
Today we have #numDocs() and #maxDoc() on IndexWriter. This is enough
to get all stats for the current index but it's subject to concurrency
and might return numbers that are not consistent ie. some cases can
return maxDoc < numDocs which is undesirable. This change adds a getDocStats()
method to index writer to allow fetching consistent numbers for these stats.

This change also deprecates IndexWriter#numDocs() and IndexWriter#maxDoc()
and replaces all their usages wiht IndexWriter#getDocStats()
2018-12-14 19:36:25 +01:00
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