default AsyncBufferedMutator getBufferedMutator(TableName tableName, ExecutorService pool) {
    return getBufferedMutatorBuilder(tableName, pool).build();
  }
Retrieve an {@link AsyncBufferedMutator} for performing client-side buffering of writes.
<p>
The returned instance will use default configs. Use
{@link #getBufferedMutatorBuilder(TableName, ExecutorService)} if you want to customize some
configs.
@param tableName the name of the table
@param pool      the thread pool to use for executing callback
@return an {@link AsyncBufferedMutator} for the supplied tableName.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnection.java