LinkedIn preemptively assuaged such fears by promising to make key components of the IndexTank API open-source, allowing other cloud providers to provide IndexTank-compatible search services requiring little to no client-side reconfiguration.
But why worry about IndexTank at all, when other open-source search solutions, like Lucene/Solr, are so widely available?
Gautam Rege explains why. For instance:
"Accessibility is awesome. I can create and update documents on IndexTank at will! That is I dont need to index / re-index or add delta’s to my database, because IndexTank is not dependent on my database or even my schema!"
Read Gautam's full discussion here.