Fix FiltersIT

Signed-off-by: Sachin Kale <kalsac@amazon.com>

Author: Sachin Kale

server/src/internalClusterTest/java/org/opensearch/search/aggregations/bucket/FiltersIT.java

@@ -69,7 +69,7 @@
 
 public class FiltersIT extends OpenSearchIntegTestCase {
 
-    static int numDocs, numTag1Docs, numTag2Docs, numOtherDocs;
+    int numDocs, numTag1Docs, numTag2Docs, numOtherDocs;
 
     @Before
     public void setupTest() throws Exception {