Fix test failures due to thread leaks

Signed-off-by: Shreyansh Ray <[email protected]>

Author: rayshrey

server/src/test/java/org/opensearch/index/store/remote/filecache/FileCacheTests.java

@@ -26,6 +26,7 @@
 import java.nio.file.Path;
 import java.util.List;
 
+@ThreadLeakFilters(filters = CleanerDaemonThreadLeakFilter.class)
 public class FileCacheTests extends OpenSearchTestCase {
     // need concurrency level to be static to make these tests more deterministic because capacity per segment is dependent on
     // (total capacity) / (concurrency level) so having high concurrency level might trigger early evictions which is tolerable in real life

server/src/test/java/org/opensearch/index/store/remote/filecache/FileCachedIndexInputTests.java

@@ -20,6 +20,7 @@
 import java.io.IOException;
 import java.nio.file.Path;
 
+@ThreadLeakFilters(filters = CleanerDaemonThreadLeakFilter.class)
 public class FileCachedIndexInputTests extends OpenSearchTestCase {
 
     protected FileCache fileCache;