@Test
 public void removeNamespaceHolderMultipleParts() {
   assertEquals(
       "value/value2",
       RootTopicExtractorHelper.removeNamespaceHolder("{namespace}value/{namespace2}value2"));
 }
 @Test
 public void removeNamespaceHolderNoNamespace() {
   assertEquals("value", RootTopicExtractorHelper.removeNamespaceHolder("value"));
 }
 @Test
 public void removeNamespaceHolderPreData() {
   assertEquals("xxvalue", RootTopicExtractorHelper.removeNamespaceHolder("xx{namespace}value"));
 }