We use Lucene for indexing the documents and have custom workflow(front end). What are the advantages of using elastic search server over using Lucene and building custom programs?
How does elastic search compares with Google custom search in enterprise search ?
With Elasticsearch you get a lot of stuff out of the box that many people seem to need to implement when using raw Lucene as well. Aggregations (used for analytics) are a component specific to Elasticsearch, so is the REST API and its distributed model (which allows for sharding and replication). Also because of the REST API you can de-couple search from your application and upgrade them independently, assuming you reach a point where you treat Lucene as yet another data store.
I don't know about how it compares to Google solutions, from what I hear (from clients) Elasticsearch is more configurable. You have pretty much all the Lucene knobs exposed (and lots of Elasticsearch-specific ones).
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