Search engine info on System Information page on Services tab for opensearch is not precise.

Steps:

1. Set opensearch as search engine.
2. Log in as admin to backoffice.
3. Go to Admin / System Information / Services.
4. Check Serach engine value.

Actual result: For opensearch elasticsearch is displayed.
Expected result: It's possible to tell from Services tab wether elastic or open search is used.

Remarks: Does not affect v3.3, feature introduced from v4.