/**
   * Handle "UNLOAD" Action
   *
   * @param req
   * @param rsp
   * @return true if a modification has resulted that requires persistance of the CoreContainer
   *     configuration.
   */
  protected boolean handleUnloadAction(SolrQueryRequest req, SolrQueryResponse rsp)
      throws SolrException {
    SolrParams params = req.getParams();
    String cname = params.get(CoreAdminParams.CORE);
    SolrCore core = coreContainer.remove(cname);
    if (core == null) {
      throw new SolrException(
          SolrException.ErrorCode.BAD_REQUEST, "No such core exists '" + cname + "'");
    }
    if (params.getBool(CoreAdminParams.DELETE_INDEX, false)) {
      core.addCloseHook(
          new CloseHook() {
            @Override
            public void preClose(SolrCore core) {}

            @Override
            public void postClose(SolrCore core) {
              File dataDir = new File(core.getIndexDir());
              for (File file : dataDir.listFiles()) {
                if (!file.delete()) {
                  log.error(file.getAbsolutePath() + " could not be deleted on core unload");
                }
              }
              if (!dataDir.delete())
                log.error(dataDir.getAbsolutePath() + " could not be deleted on core unload");
            }
          });
    }
    core.close();
    return coreContainer.isPersistent();
  }
  /**
   * Handle "RENAME" Action
   *
   * @param req
   * @param rsp
   * @return true if a modification has resulted that requires persistance of the CoreContainer
   *     configuration.
   * @throws SolrException
   */
  protected boolean handleRenameAction(SolrQueryRequest req, SolrQueryResponse rsp)
      throws SolrException {
    SolrParams params = req.getParams();

    String name = params.get(CoreAdminParams.OTHER);
    String cname = params.get(CoreAdminParams.CORE);
    boolean doPersist = false;

    if (cname.equals(name)) return doPersist;

    SolrCore core = coreContainer.getCore(cname);
    if (core != null) {
      doPersist = coreContainer.isPersistent();
      coreContainer.register(name, core, false);
      coreContainer.remove(cname);
      core.close();
    }
    return doPersist;
  }
 private void removeOne(CoreContainer cc, String coreName) {
   SolrCore tmp = cc.remove(coreName);
   if (tmp != null) tmp.close();
 }