Best text search engine for integrating with custom web app?

Question

We have a web app that allows users to upload documents, create their own documents, and so on. Uploaded files are stored on Amazon S3, created information is stored in a My

Answer 1

There is also Xapian which is fast and is quite customizable.

It has support for custom indexers allowing one to index data that is not stored in a database which might be useful for your documents stored on S3.