Yeah if you look at only changes to Java files in OpenSearch (OpenSearch + Security) and Elasticsearch, the number of contributors is growing at a steady pace and who knows, it may well surpass Elasticsearch in a year or two.

     month  |    project    | authors | commits | files |  churn  
   ---------+---------------+---------+---------+-------+---------
    2022-03 | elasticsearch |      61 |     529 |   948 |   39307
    2022-03 | opensearch    |      20 |     138 |   603 |   26042
    2022-02 | elasticsearch |     110 |    2783 |  3546 |  287818
    2022-02 | opensearch    |      45 |     582 |  1441 |  126678
    2022-01 | elasticsearch |     126 |    2431 |  3609 |  360828
    2022-01 | opensearch    |      40 |     175 |   640 |   26902
    2021-12 | elasticsearch |     103 |    1803 |  4050 |  301715
    2021-12 | opensearch    |      33 |     166 |   703 |   30182
    2021-11 | elasticsearch |      94 |    1430 |  2309 |  141589
    2021-11 | opensearch    |      31 |     119 |   932 |   44234
    2021-10 | elasticsearch |     102 |    1013 | 12589 | 1217275
    2021-10 | opensearch    |      28 |     142 |  5776 | 1256157
    2021-09 | elasticsearch |      83 |     729 |  2269 |  119506
    2021-09 | opensearch    |      17 |      53 |   126 |    8336
    2021-08 | elasticsearch |      87 |     654 |  2479 |  180385
    2021-08 | opensearch    |      23 |      42 |   128 |    3610