Improve the quality of searches

[gaurav]

This comes down to the exact eDisMax query we use. As a general rule, tweaking any part of this expression results in some queries improving while others get worse.

NameResolution/api/server.py

Lines 454 to 479 in 8e6e889

	params = {
	"query": {
	"edismax": {
	"query": query,
	# qf = query fields, i.e. how should we boost these fields if they contain the same fields as the input.
	# https://solr.apache.org/guide/solr/latest/query-guide/dismax-query-parser.html#qf-query-fields-parameter
	"qf": "preferred_name_exactish^250 names_exactish^100 preferred_name^25 names^10",
	# pf = phrase fields, i.e. how should we boost these fields if they contain the entire search phrase.
	# https://solr.apache.org/guide/solr/latest/query-guide/dismax-query-parser.html#pf-phrase-fields-parameter
	"pf": "preferred_name_exactish^300 names_exactish^200 preferred_name^30 names^20",
	# Boosts
	"bq": [],
	"boost": [
	# The boost is multiplied with score -- calculating the log() reduces how quickly this increases
	# the score for increasing clique identifier counts.
	"log(sum(clique_identifier_count, 1))"
	],
	},
	},
	"sort": "score DESC, clique_identifier_count DESC, curie_suffix ASC",
	"limit": limit,
	"offset": offset,
	"filter": filters,
	"fields": "*, score",
	"params": inner_params,
	}

There is a possibility that this might work very differently if we were to switch to ElasticSearch (#182).