jpountz commented on a change in pull request #2205:
URL: https://github.com/apache/lucene-solr/pull/2205#discussion_r559043667



##########
File path: 
lucene/core/src/java/org/apache/lucene/search/DisjunctionMaxScorer.java
##########
@@ -50,7 +50,7 @@
     if (tieBreakerMultiplier < 0 || tieBreakerMultiplier > 1) {
       throw new IllegalArgumentException("tieBreakerMultiplier must be in [0, 
1]");
     }
-    if (scoreMode == ScoreMode.TOP_SCORES) {
+    if (scoreMode.needsScores()) {

Review comment:
       > so I was assuming we may need to preserve this behavior when we 
deprecate MinShouldMatchSumScorer with WANDScorer
   
   Right I'm hoping we can use WANDScorer for minShouldMatch > 1 for all values 
of ScoreMode!
   
   I believe that this exception you saw should disappear if you make sure that 
`WANDScorer` only calls `advanceShallow`/`getMaxScore` with 
`ScoreMode.TOP_SCORES`.




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