I am trying to setup a federated search between our SharePoint 2013 and SharePoint 2010 Farms. I want to show search results from SharePoint 2010 and SharePoint 2013 in my new SharePoint 2013 environment.
Is it possible to show federated search results from older version into later version of SharePoint?
I have seen multiple articles on setting up federated search including Microsoft but they all shows the same SharePoint version i.e online and on-premises.
Method i have tried so far.
1. Building Server to Server trust and publishing SharePoint 2010 Search Service to SharePoint 2013. (Both Web Applications on Classic Mode Authentication however i am unable to use the published service. I get multiple errors while using the published service related to Schema Property error and services Contract Mismatch.)
2. Configuring Remote SharePoint result sources and Query Rules
3. Creating new content source and providing SharePoint 2010 URL in it for crawling. (This method crawled only root site collection)
Any other possible way to achieve the target? Am i looking on the wrong side to do the stuff? Please guide.