Change RemoteDirectory.close to a no-op

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

server/src/main/java/org/opensearch/index/store/RemoteDirectory.java

@@ -94,11 +94,12 @@ public IndexInput openInput(String name, IOContext context) throws IOException {
     }
 
     /**
-     * Closes the directory by deleting all the files in this directory
+     * Closes the remote directory. Currently, it is a no-op.
+     * If remote directory maintains a state in future, we need to clean it before closing the directory
      */
     @Override
     public void close() throws IOException {
-        blobContainer.delete();
+        // Do nothing
     }
 
     /**

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

@@ -109,18 +109,6 @@ public void testOpenInputNoSuchFileException() throws IOException {
         assertThrows(NoSuchFileException.class, () -> remoteDirectory.openInput("segment_1", IOContext.DEFAULT));
     }
 
-    public void testClose() throws IOException {
-        remoteDirectory.close();
-
-        verify(blobContainer).delete();
-    }
-
-    public void testCloseIOException() throws IOException {
-        when(blobContainer.delete()).thenThrow(new IOException("Error while writing to blob store"));
-
-        assertThrows(IOException.class, () -> remoteDirectory.close());
-    }
-
     public void testFileLength() throws IOException {
         Map<String, BlobMetadata> fileInfo = new HashMap<>();
         fileInfo.put("segment_1", new PlainBlobMetadata("segment_1", 100));