Support multiple indexes

[chammaaomar]

Currently only a single possible index is support, due to the global variable index in adapter.ts. It would be helpful if getSearchClient could take an index parameter. It currently looks like it does, since it takes the parameter newIndex?: any, but this newIndex is only used as index || newIndex, so if there's an existing index, newIndex ignored. Not sure if that's intentional. Hope my issue is clear. Thanks for developing and maintaining this library.

[Ruitjes]

Hi @chammaaomar thank you for using the package. As it has been a while since I last worked on the library, I am not sure if it was done intentional or not. I currently do not have the time to test or make any updates. I suggest that you consider implementing support for multiple indexes yourself and submitting a pull request for review. This would be the best way forward.

[chammaaomar]

No worries, thank you for the response. I'll look into and hopefully get back to you.