@Override
  public CompletableFuture<Void> compactRegionServer(ServerName sn) {
    return compactRegionServer(sn, false);
  }
This method is for internal use only, where we need the response of the flush.
<p/>
As it exposes the protobuf message, please do <strong>NOT</strong> try to expose it as a public
API.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncHBaseAdmin.java