Use ElasticSearch for the search page

[ycanardeau]

Split from VocaDB/vocadb#663

[riipah]

Allow me to elaborate that ElasticSearch, based on Lucene text analysis, is a text search engine, somewhat similar to Google, but more customizable. Self-hosted ElasticSearch is free under Apache 2.0 license. The benefits would be mainly:

• Lightning-fast text searches with multiple words.
• Other keywords such as song length could also be included. Or imagine searching for song by artist + title. "doriko romeo and cinderella"
• Language-specific analysis, for example splitting words based on language rules instead of just whitespace.

ElasticSearch is a Java (JVM) based service. I would recommend hosting it on a virtual machine, but it could also run on the same machine as the main website.

I should also mention that these should be doable with plain Lucene (there is a .NET library). ElasticSearch mainly just adds nicer API (there is a .NET client) and the "elasticity", meaning it scales if needed. Lucene is lower level, so working with it is probably more complicated (I've used ES before, but not Lucene).

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