It will be great if you add indexer connector or give a simple tutorial to add connector by itself. Please help me with this really need it.
We have a Work in progress tutorial of how to build connectors here:
https://github.com/nielsbosma/SeoTools-for-Excel-Connectors/wiki/How-to-build-Connectors
Easiest is if you look at the existing connector code, found in the Connectors folder, and copy paste to make your own.