Removed unneeded function

Author: Supplementing

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java

@@ -4306,10 +4306,4 @@ private IndexAbstraction mockIndexAbstraction(String name) {
         return mock;
     }
 
-    private IndexAbstraction mockIndexAbstraction(String name, IndexAbstraction.Type type) {
-        IndexAbstraction mock = mock(IndexAbstraction.class);
-        when(mock.getName()).thenReturn(name);
-        when(mock.getType()).thenReturn(type);
-        return mock;
-    }
 }