public boolean abort(long procId) {
    return abort(procId, true);
  }
Send an abort notification the specified procedure. Depending on the procedure implementation
the abort can be considered or ignored.
@param procId the procedure to abort
@return true if the procedure exists and has received the abort, otherwise false.
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.java