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Are you sure? I thought Algolia literally was Solr (which is ElasticSearch which is Lucene).

Yes, I'm sure. I talked to one of the founders about 2 years ago. Algolia is written in C / C++ from the ground up.

your comment is a bit confusing: both Solr and ElasticSearch are built on top of Lucene.

Algolia is _not_ built on top of lucene at all.