IndexTank sold at a good time. Exactly why I wouldn't consider creating any kind of infrastructure like this.
I already use nearly all of AWS services, and I'll likely switch from Solr to whatever this is. They keep doing such a damn good job on features, reliability, and price.
I'm currently evaluating which architecture is better for my startup project: I'm thinkin about hosting my own Solr instance (i've already used it in a Drupal project), using an external hosted Solr solution, using another engine (i.e. i discovered basex.org - anyone has used it? my data will be 90% XML) or something else. Probably I'll have to add this to the list...
edit: I didnt consider IndexTank but it seems interesting, I have just to understand if it's a good solution if you dont need social inputs
That's only relevant if all you do is search. If you're using a commodity search engine, as so many people are, an AWS offering lets you shrink the number of areas which you have to think about so you can focus on your big ideas.
I already use nearly all of AWS services, and I'll likely switch from Solr to whatever this is. They keep doing such a damn good job on features, reliability, and price.