@Deprecated
  default Future<Void> mergeRegionsAsync(byte[] nameOfRegionA, byte[] nameOfRegionB,
    boolean forcible) throws IOException {
    byte[][] nameofRegionsToMerge = new byte[2][];
    nameofRegionsToMerge[0] = nameOfRegionA;
    nameofRegionsToMerge[1] = nameOfRegionB;
    return mergeRegionsAsync(nameofRegionsToMerge, forcible);
  }
Merge two regions. Asynchronous operation.
@param nameOfRegionA encoded or full name of region a
@param nameOfRegionB encoded or full name of region b
@param forcible      <code>true</code> if do a compulsory merge, otherwise we will only merge
                     two adjacent regions
@throws IOException if a remote or network exception occurs
@deprecated since 2.3.0 and will be removed in 4.0.0. Multi-region merge feature is now
            supported. Use {@link #mergeRegionsAsync(byte[][], boolean)} instead.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Admin.java