Upgrade to lucene 7.7.2 (#47901)

This brings in a number of lucene bug-fixes, including:

LUCENE-8735: FilterDirectory.getPendingDeletions now forwards to the delegate
even the method is not abstract in the super class. This prevents issues
where our best effort in carrying on generations in the IndexWriter since pending
deletions are swallowed by the FilterDirectory.

LUCENE-8688: TieredMergePolicy#findForcedMerges now tries to create the
cheapest merges that allow the index to go down to maxSegmentCount segments
or less

LUCENE-8785: Ensure new threadstates are locked before retrieving the number of
active threadstates. This causes assertion errors and potentially broken field attributes
in the IndexWriter when . IndexWriter#deleteAll is called while actively indexing

LUCENE-8809: Refresh and rollback concurrently can leave segment states unclosed

Author: romseygeek

buildSrc/version.properties

@@ -1,5 +1,5 @@
 elasticsearch     = 6.8.4
-lucene            = 7.7.0
+lucene            = 7.7.2
 
 # optional dependencies
 spatial4j         = 0.7

docs/Versions.asciidoc

@@ -0,0 +1 @@
+1600b7bf11dc54fb81f846d88fd42a89ae311793

modules/lang-expression/licenses/lucene-expressions-7.7.0.jar.sha1

@@ -0,0 +1 @@
+5ac4e60623ea69de8446d1729c95a92f248d91f2

modules/lang-expression/licenses/lucene-expressions-7.7.2.jar.sha1

@@ -0,0 +1 @@
+4d1196c614ff20c09c500fb0a3e9f6f5978ef14b

plugins/analysis-icu/licenses/lucene-analyzers-icu-7.7.0.jar.sha1

@@ -0,0 +1 @@
+88fa846b85166cc758c95c34a1f69f310586bb0e