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