default CompletableFuture<List<Result>> getAll(List<Get> gets) {
    return allOf(get(gets));
  }
A simple version for batch get. It will fail if there are any failures and you will get the
whole result list at once if the operation is succeeded.
@param gets The objects that specify what data to fetch and from which rows.
@return A {@link CompletableFuture} that wrapper the result list.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncTable.java