core/src/main/java/com/orientechnologies/orient/core/storage/impl/local/OAbstractPaginatedStorage.java
public final void renameCluster(final String oldName, final String newName) {
    try {
      clusterMap.put(newName.toLowerCase(configuration.getLocaleInstance()),
          clusterMap.remove(oldName.toLowerCase(configuration.getLocaleInstance())));
    } catch (final RuntimeException ee) {
      throw logAndPrepareForRethrow(ee);
    } catch (final Error ee) {
      throw logAndPrepareForRethrow(ee);
    } catch (final Throwable t) {
      throw logAndPrepareForRethrow(t);
    }
  }
public final void renameCluster(final String oldName, final String newName) {
    try {
      clusterMap.put(newName.toLowerCase(configuration.getLocaleInstance()),
          clusterMap.remove(oldName.toLowerCase(configuration.getLocaleInstance())));
    } catch (final RuntimeException ee) {
      throw logAndPrepareForRethrow(ee);
    } catch (final Error ee) {
      throw logAndPrepareForRethrow(ee);
    } catch (final Throwable t) {
      throw logAndPrepareForRethrow(t);
    }
  }
Method that completes the cluster rename operation. <strong>IT WILL NOT RENAME A CLUSTER, IT JUST CHANGES THE NAME IN THE
INTERNAL MAPPING</strong>