Discovery versus analysis

Need to recognise that the aim of the search indexing is to present the user with items that could be of relevance, but this fuzziness might limit the usefulness of search results for analysis. Eg: user-added tags and comments are searched by default. Examine relevance ranking.

Some notes on relevance from solr docs: https://solr.apache.org/guide/solr/latest/deployment-guide/solrcloud-distributed-requests.html#distributedidf