diff --git a/server/src/main/java/org/elasticsearch/index/store/DirectoryUtils.java b/server/src/main/java/org/elasticsearch/index/store/DirectoryUtils.java
deleted file mode 100644
index 11203a8198770..0000000000000
--- a/server/src/main/java/org/elasticsearch/index/store/DirectoryUtils.java
+++ /dev/null
@@ -1,83 +0,0 @@
-/*
- * Licensed to Elasticsearch under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-package org.elasticsearch.index.store;
-
-import org.apache.lucene.store.Directory;
-import org.apache.lucene.store.FileSwitchDirectory;
-import org.apache.lucene.store.FilterDirectory;
-
-/**
- * Utils for working with {@link Directory} classes.
- */
-public final class DirectoryUtils {
-
-    private DirectoryUtils() {} // no instance
-
-    static <T extends Directory> Directory getLeafDirectory(FilterDirectory dir, Class<T> targetClass) {
-        Directory current = dir.getDelegate();
-        while (true) {
-            if ((current instanceof FilterDirectory)) {
-                if (targetClass != null && targetClass.isAssignableFrom(current.getClass())) {
-                    break;
-                }
-                current = ((FilterDirectory) current).getDelegate();
-            } else {
-                break;
-            }
-        }
-        return current;
-    }
-
-    /**
-     * Tries to extract the leaf of the {@link Directory} if the directory is a {@link FilterDirectory} and cast
-     * it to the given target class or returns <code>null</code> if the leaf is not assignable to the target class.
-     * If the given {@link Directory} is a concrete directory it will treated as a leaf and the above applies.
-     */
-    public static <T extends Directory> T getLeaf(Directory dir, Class<T> targetClass) {
-        return getLeaf(dir, targetClass, null);
-    }
-    /**
-     * Tries to extract the leaf of the {@link Directory} if the directory is a {@link FilterDirectory} and cast
-     * it to the given target class or returns the given default value, if the leaf is not assignable to the target class.
-     * If the given {@link Directory} is a concrete directory it will treated as a leaf and the above applies.
-     */
-    public static <T extends Directory> T getLeaf(Directory dir, Class<T> targetClass, T defaultValue) {
-        Directory d = dir;
-        if (dir instanceof FilterDirectory) {
-            d = getLeafDirectory((FilterDirectory) dir, targetClass);
-        }
-        if (d instanceof FileSwitchDirectory) {
-            T leaf = getLeaf(((FileSwitchDirectory) d).getPrimaryDir(), targetClass);
-            if (leaf == null) {
-                d = getLeaf(((FileSwitchDirectory) d).getSecondaryDir(), targetClass, defaultValue);
-            } else {
-                d = leaf;
-            }
-        }
-
-        if (d != null && targetClass.isAssignableFrom(d.getClass())) {
-            return targetClass.cast(d);
-        } else {
-            return defaultValue;
-        }
-    }
-
-
-}
diff --git a/server/src/test/java/org/elasticsearch/index/store/DirectoryUtilsTests.java b/server/src/test/java/org/elasticsearch/index/store/DirectoryUtilsTests.java
deleted file mode 100644
index 57265872c4c79..0000000000000
--- a/server/src/test/java/org/elasticsearch/index/store/DirectoryUtilsTests.java
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * Licensed to Elasticsearch under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.elasticsearch.index.store;
-
-import org.apache.lucene.store.BaseDirectoryWrapper;
-import org.apache.lucene.store.FSDirectory;
-import org.apache.lucene.store.FileSwitchDirectory;
-import org.apache.lucene.store.FilterDirectory;
-import org.apache.lucene.store.RAMDirectory;
-import org.elasticsearch.test.ESTestCase;
-
-import java.io.IOException;
-import java.nio.file.Path;
-import java.util.Collections;
-import java.util.Set;
-
-import static org.hamcrest.CoreMatchers.notNullValue;
-import static org.hamcrest.CoreMatchers.nullValue;
-import static org.hamcrest.CoreMatchers.sameInstance;
-
-public class DirectoryUtilsTests extends ESTestCase {
-    public void testGetLeave() throws IOException {
-        Path file = createTempDir();
-        final int iters = scaledRandomIntBetween(10, 100);
-        for (int i = 0; i < iters; i++) {
-            {
-                BaseDirectoryWrapper dir = newFSDirectory(file);
-                FSDirectory directory = DirectoryUtils.getLeaf(new FilterDirectory(dir) {}, FSDirectory.class, null);
-                assertThat(directory, notNullValue());
-                assertThat(directory, sameInstance(DirectoryUtils.getLeafDirectory(dir, null)));
-                dir.close();
-            }
-
-            {
-                BaseDirectoryWrapper dir = newFSDirectory(file);
-                FSDirectory directory = DirectoryUtils.getLeaf(dir, FSDirectory.class, null);
-                assertThat(directory, notNullValue());
-                assertThat(directory, sameInstance(DirectoryUtils.getLeafDirectory(dir, null)));
-                dir.close();
-            }
-
-            {
-                Set<String> stringSet = Collections.emptySet();
-                BaseDirectoryWrapper dir = newFSDirectory(file);
-                FSDirectory directory = DirectoryUtils.getLeaf(new FileSwitchDirectory(stringSet, dir, dir, random().nextBoolean()), FSDirectory.class, null);
-                assertThat(directory, notNullValue());
-                assertThat(directory, sameInstance(DirectoryUtils.getLeafDirectory(dir, null)));
-                dir.close();
-            }
-
-            {
-                Set<String> stringSet = Collections.emptySet();
-                BaseDirectoryWrapper dir = newFSDirectory(file);
-                FSDirectory directory = DirectoryUtils.getLeaf(new FilterDirectory(new FileSwitchDirectory(stringSet, dir, dir, random().nextBoolean())) {}, FSDirectory.class, null);
-                assertThat(directory, notNullValue());
-                assertThat(directory, sameInstance(DirectoryUtils.getLeafDirectory(dir, null)));
-                dir.close();
-            }
-
-            {
-                Set<String> stringSet = Collections.emptySet();
-                BaseDirectoryWrapper dir = newFSDirectory(file);
-                RAMDirectory directory = DirectoryUtils.getLeaf(new FilterDirectory(new FileSwitchDirectory(stringSet, dir, dir, random().nextBoolean())) {}, RAMDirectory.class, null);
-                assertThat(directory, nullValue());
-                dir.close();
-            }
-
-        }
-    }
-}