@Override
  public CompletableFuture<Void> deleteSnapshots(Pattern snapshotNamePattern) {
    Preconditions.checkNotNull(snapshotNamePattern, "snapshotNamePattern is null."
      + " If you don't specify a snapshotNamePattern, use deleteSnapshots() instead");
    return internalDeleteSnapshots(null, snapshotNamePattern);
  }
Compact the region at specific region server.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncHBaseAdmin.java