Remove sync method unit test

Signed-off-by: Gagan Singh Saini <gagasa@amazon.com>

Author: Gagan Singh Saini

server/src/test/java/org/opensearch/index/store/CompositeDirectoryTests.java

@@ -126,21 +126,6 @@ public void testCreateOutput() throws IOException {
         assertNotNull(fileCache.get(localDirectory.getDirectory().resolve(NEW_FILE)));
     }
 
-    public void testSync() throws IOException {
-        // All the files in the below list are present either locally or on remote, so sync should work as expected
-        Collection<String> names = List.of("_0.cfe", "_0.cfs", "_0.si", "_1.cfe", "_2.cfe", "segments_1");
-        compositeDirectory.sync(names);
-        // Deleting file _1.cfe and then adding its blocks locally so that full file is not present but block files are present in local
-        // State of _1.cfe file after these operations - not present in remote, full file not present locally but blocks present in local
-        compositeDirectory.deleteFile("_1.cfe");
-        addFilesToDirectory(new String[] { "_1.cfe_block_0", "_1.cfe_block_2" });
-        // Sync should work as expected since blocks are present in local
-        compositeDirectory.sync(List.of("_1.cfe"));
-        // Below list contains a non-existent file, hence will throw an error
-        Collection<String> names1 = List.of("_0.cfe", "_0.cfs", "_0.si", "_1.cfe", "_2.cfe", "segments_1", "non_existent_file");
-        assertThrows(NoSuchFileException.class, () -> compositeDirectory.sync(names1));
-    }
-
     public void testRename() throws IOException {
         // Rename should work as expected for file present in directory
         assertTrue(existsInCompositeDirectory(FILE_PRESENT_LOCALLY));