Stop requiring MaxScoreBulkScorer's outer window from having at least…

… INNER_WINDOW_SIZE docs. (#13582)

Currently `MaxScoreBulkScorer` requires its "outer" window to be at least
`WINDOW_SIZE`. The intuition there was that we should make sure we should use
the whole range of the bit set that we are using to collect matches. The
downside is that it may force us to use an upper level in the skip list that
has worse upper bounds for the scores.

lucene/CHANGES.txt

@@ -292,6 +292,9 @@ Optimizations
 * GITHUB#12100: WordBreakSpellChecker.suggestWordBreaks now does a breadth first search, allowing it to return
   better matches with fewer evaluations (hossman)
 
+* GITHUB#13582: Stop requiring MaxScoreBulkScorer's outer window from having at
+  least INNER_WINDOW_SIZE docs. (Adrien Grand)
+
 Changes in runtime behavior
 ---------------------
 

lucene/core/src/java/org/apache/lucene/search/MaxScoreBulkScorer.java

@@ -271,11 +271,6 @@ private int computeOuterWindowMax(int windowMin) throws IOException {
       windowMax = (int) Math.min(windowMax, upTo + 1L); // upTo is inclusive
     }
 
-    // Score at least an entire inner window of docs
-    windowMax =
-        Math.max(
-            windowMax, (int) Math.min(Integer.MAX_VALUE, (long) windowMin + INNER_WINDOW_SIZE));
-
     return windowMax;
   }