code: public static UpdateResult acknowledged(final long matchedCount, @Nullable final Long modifiedCount,
                                              @Nullable final BsonValue upsertedId) {
          return new AcknowledgedUpdateResult(matchedCount, modifiedCount, upsertedId);
      }
docs: Create an acknowledged UpdateResult
  
  @param matchedCount  the number of documents matched
  @param modifiedCount the number of documents modified
  @param upsertedId    if the replace resulted in an inserted document, the id of the inserted document
  @return an acknowledged UpdateResult