we currently have one SP farm with a couple of SharePoint 2013 On-Premise servers (behind a load-balancer) and also a separate SharePoint Online instance. We have been asked to implement Cloud Hybrid Search, such that the results from SPO should show up in the on-prem site (along with on-prem search results). Also the results from on-prem should show up in the SPO site search results. So basically it has to be a two-way/bi-directional search. Is this possible in Cloud Hybrid Search? I have seen several articles saying that Inward and Outward (bi-directional) search results are possible using Federated Hybrid Search, but I don't know if it is possible in Cloud Hybrid Search as well. Is this possible? Sorry I have never implemented this before.
Note: We are not interested in "Federated Hybrid Search".