@Deprecated
  default CompletableFuture<Void> mergeRegions(byte[] nameOfRegionA, byte[] nameOfRegionB,
    boolean forcible) {
    return mergeRegions(Arrays.asList(nameOfRegionA, nameOfRegionB), forcible);
  }
Merge two regions.
@param nameOfRegionA encoded or full name of region a
@param nameOfRegionB encoded or full name of region b
@param forcible      true if do a compulsory merge, otherwise we will only merge two adjacent
                     regions
@deprecated since 2.3.0 and will be removed in 4.0.0.Use {@link #mergeRegions(List, boolean)}
            instead.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdmin.java