add int test

Author: joykim1005

driver-core/src/test/functional/com/mongodb/client/model/search/AggregatesSearchIntegrationTest.java

@@ -79,6 +79,7 @@
 import static com.mongodb.client.model.search.SearchOperator.autocomplete;
 import static com.mongodb.client.model.search.SearchOperator.compound;
 import static com.mongodb.client.model.search.SearchOperator.dateRange;
+import static com.mongodb.client.model.search.SearchOperator.equalsNull;
 import static com.mongodb.client.model.search.SearchOperator.exists;
 import static com.mongodb.client.model.search.SearchOperator.near;
 import static com.mongodb.client.model.search.SearchOperator.numberRange;
@@ -610,7 +611,9 @@ private static Stream<Arguments> searchAndSearchMetaArgs() {
                                                 .lte(Instant.ofEpochMilli(1)),
                                         near(0, 1.5, fieldPath("fieldName7"), fieldPath("fieldName8")),
                                         near(Instant.ofEpochMilli(1), Duration.ofMillis(3), fieldPath("fieldName9")),
-                                        phrase(fieldPath("fieldName10"), "term6")
+                                        phrase(fieldPath("fieldName10"), "term6"),
+                                        SearchOperator.equals(fieldPath("fieldName11"), "term7"),
+                                        equalsNull(fieldPath("fieldName12"))
                                 ))
                                 .minimumShouldMatch(1)
                                 .mustNot(singleton(