Experiment with vespa

[kermitt2]

Matching of full raw reference string provides the best accuracy but is also the most expensive, so scaling with this kind of queries supposes to add many elasticsearch nodes.

It could be interesting to experiment with vespa as alternative to elasticsearch to see if it speeds up the search query rate.

[kermitt2]

See https://vespa.ai/migrating-from-elastic-search-to-vespa