fix test

core/src/test/java/org/elasticsearch/index/query/TermsQueryBuilderTests.java

@@ -41,6 +41,7 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.stream.Collectors;
 
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
@@ -282,7 +283,8 @@ public class TermsQueryBuilderTests extends AbstractQueryTestCase<TermsQueryBuil
         } catch (UnsupportedOperationException ex) {
             assertEquals("query must be rewritten first", ex.getMessage());
         }
-        assertEquals(termsQueryBuilder.rewrite(queryShardContext()), new TermsQueryBuilder(STRING_FIELD_NAME, randomTerms));
+        assertEquals(termsQueryBuilder.rewrite(queryShardContext()), new TermsQueryBuilder(STRING_FIELD_NAME,
+            randomTerms.stream().filter(x -> x != null).collect(Collectors.toList()))); // terms lookup removes null values
     }
 }