Manually sync up changes with branch_10x.

Author: dweiss

lucene/CHANGES.txt

@@ -208,6 +208,8 @@ Bug Fixes
   removing co-planar points to do it once after all holes are removed instead of doing it for each
   removed hole.
 
+* GITHUB#15213: Don't normalize centroids with zero samples, which caused divide-by-zero. (Mike Sokolov)
+
 * GITHUB#15319: Fix potential hang in initialisation of TermsEnum and BaseTermsEnum (Chris Hegarty)
 
 Other
@@ -378,6 +380,8 @@ Optimizations
 
 * GITHUB#14991: Refactor for loop at PointRangeQuery hot path. (Ge Song)
 
+* GITHUB#15010: Improve off-heap KNN byte vector query performance in cases where indexing and search are performed by the same process. (Kaival Parikh)
+
 * GITHUB#15001: Remove full integrity check from SortingStoredFieldsConsumer (Martijn van Groningen)
 
 * GITHUB#14980, GITHUB#15037: Add bulk off-heap scoring for float32 vectors (Chris Hegarty)
@@ -391,6 +395,8 @@ Optimizations
 
 * GITHUB#15083: Use DocValuesSkippers in SortedNumericDocValuesRangeQuery#rewrite(). (Alan Woodward)
 
+* GITHUB#15085, GITHUB#15092: Hunspell suggestions: Ensure candidate roots are not worse before updating. (Ilia Permiashkin)
+
 * GITHUB#15045: Use FixedBitSet#cardinality for counting liveDocs in CheckIndex (Zhang Chao)
 
 
@@ -402,6 +408,8 @@ Optimizations
   and uses an optimized branchless approach. Any subclasses that have implemented the optimized method
   need to remove it as it will disappear in Lucene 11.  (Uwe Schindler)
 
+* GITHUB#14991: Refactor for loop at PointRangeQuery hot path. (Ge Song)
+
 Changes in Runtime Behavior
 ---------------------
 * GITHUB#14823: Decrease TieredMergePolicy's default number of segments per
@@ -415,7 +423,7 @@ Changes in Runtime Behavior
   `-Dorg.apache.lucene.store.defaultReadAdvice=RANDOM`. (Chris Hegarty)
 
 * GITHUB#15078: Reduce the default RefCountedSharedArena.DEFAULT_MAX_PERMITS to 64. To restore
-  previous behavior set the `-Dorg.apache.lucene.store.MMapDirectory.sharedArenaMaxPermits=1024`.
+  previous behavior set `-Dorg.apache.lucene.store.MMapDirectory.sharedArenaMaxPermits=1024`.
   (Chris Hegarty)
 
 Bug Fixes
@@ -807,9 +815,14 @@ Optimizations
 * GITHUB#14032: Speed up PostingsEnum when positions are requested.
   (Adrien Grand)
 
+* GITHUB#14011: Reduce allocation rate in HNSW concurrent merge. (Viliam Durina)
+
 * GITHUB#14040: Specialized top-level DisjunctionMaxQuery evaluation when the
   tie break multiplier is 0. (Adrien Grand)
 
+* GITHUB#14022: Optimize DFS marking of connected components in HNSW by reducing stack depth, improving performance
+  and reducing allocations. (Viswanath Kuchibhotla)
+
 Bug Fixes
 ---------------------
 * GITHUB#13832: Fixed an issue where the DefaultPassageFormatter.format method did not format passages as intended