benwtrent commented on code in PR #13990:
URL: https://github.com/apache/lucene/pull/13990#discussion_r1838141983


##########
lucene/core/src/test/org/apache/lucene/search/TestKnnFloatVectorQuery.java:
##########
@@ -29,13 +29,7 @@
 import org.apache.lucene.document.Field;
 import org.apache.lucene.document.KnnFloatVectorField;
 import org.apache.lucene.document.StringField;
-import org.apache.lucene.index.DirectoryReader;
-import org.apache.lucene.index.IndexReader;
-import org.apache.lucene.index.IndexWriter;
-import org.apache.lucene.index.IndexWriterConfig;
-import org.apache.lucene.index.LeafReaderContext;
-import org.apache.lucene.index.QueryTimeout;
-import org.apache.lucene.index.VectorSimilarityFunction;
+import org.apache.lucene.index.*;

Review Comment:
   Let's not collapse to `*`



##########
lucene/core/src/java/org/apache/lucene/search/KnnFloatVectorQuery.java:
##########
@@ -112,7 +112,14 @@ VectorScorer createVectorScorer(LeafReaderContext context, 
FieldInfo fi) throws
 
   @Override
   public String toString(String field) {
-    return getClass().getSimpleName() + ":" + this.field + "[" + target[0] + 
",...][" + k + "]";
+    StringBuilder buffer = new StringBuilder();
+    buffer.append(getClass().getSimpleName() + ":");
+    buffer.append(this.field + "[" + target[0] + ",...]");
+    buffer.append("[" + k + "]");
+    if (this.filter != null) {
+      buffer.append(",filter:[" + this.filter + "]");
+    }

Review Comment:
   ```suggestion
       if (this.filter != null) {
         buffer.append("[" + this.filter + "]");
       }
   ```
   
   I think that would be better.



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