title: Azure Search indexer data source
body: <p>I have created an Index with an indexer and data source. But I don't remember the data source connection? I would like to know where the index is indexing the data from. 
  I have tried the GET data source REST but the connection string is not there. 
  How can I find out the source of the data?
  It would be beneficial to know after it was created. Especially if your not the person that created the index in the first place.</p>