@Override
  protected OperatorSpec<KV<K, V>, KV<K, V>> getOperatorSpec() {
    return sendToTableOpSpec;
  }
Implementation of a send-stream-to-table operator that stores the record
in the table.

@param <K> the type of the record key
@param <V> the type of the record value
samza-core/src/main/java/org/apache/samza/operators/impl/SendToTableOperatorImpl.java