private boolean filterDefaultMetaRegions() {
    if (regionsOnCrashedServer == null) {
      return false;
    }
    regionsOnCrashedServer.removeIf(this::isDefaultMetaRegion);
    return !regionsOnCrashedServer.isEmpty();
  }
Returns List of Regions on crashed server.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ServerCrashProcedure.java