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Open-source platform that enables near real-time indexing, database integration, dynamic clustering, full-text search, monitorable logging, rich document parsing, and more.
We use solr to index our institutional repository data
Pros: It is very flexible and customize-able which makes it very easy to integrate-able with other components in the development stack.
Cons: the query language could be a bit confusing at first. If the collection is large, it often takes a long time to index the data.
Reliable and very scalable indexing software that I have used
Pros: (1) It is highly scalable
(2) It is based on a distributed model
(3) load balancing happens by default when querying
(4) Indexing is really fast
Cons: It hits a limitation as full text indexes grow beyond the amount of available memory on the servers
Open source search engine
Pros: SOLR is a very flexible search engine, with a lot of feature for this specific topic. Easy to configure using a GUI.
Overall: I used it for a web crawling scenario. In this case I used it together with Apache Nutch, not a native plugin has been provided. Documentation could be more clear and complete.