docs: protected String getCore() {
  
          try {
              return m_configObject.getString(JSON_KEY_CORE);
          } catch (JSONException e) {
              if (null == m_baseConfig) {
                  if (LOG.isInfoEnabled()) {
                      LOG.info(Messages.get().getBundle().key(Messages.LOG_NO_CORE_SPECIFIED_0), e);
                  }
                  return null;
              } else {
                  return m_baseConfig.getGeneralConfig().getSolrCore();
              }
          }
      }