private SearchResultSet generalSearch(string searchString)
{
var defaultField = ALL;
using var index = getIndex();
using var searcher = new IndexSearcher(index);
using var analyzer = new StandardAnalyzer(Version);
var query = analyzer.GetQuery(defaultField, searchString);
// lucene doesn't allow only negations. eg this returns nothing:
// -tags:hidden
// work arounds: https://kb.ucla.edu/articles/pure-negation-query-in-lucene
// HOWEVER, doing this to any other type of query can cause EVERYTHING to be a match unless "Occur" is carefully set
// this should really check that all leaf nodes are MUST_NOT
if (query is BooleanQuery boolQuery)
{
var occurs = getOccurs_recurs(boolQuery);
if (occurs.Any() && occurs.All(o => o == Occur.MUST_NOT))
{
boolQuery.Add(new MatchAllDocsQuery(), Occur.MUST);
}
}
var docs = searcher
.Search(query, searcher.MaxDoc + 1)
.ScoreDocs
.Select(ds => new ScoreDocExplicit(searcher.Doc(ds.Doc), ds.Score))
.ToList();
var queryString = query.ToString();
Serilog.Log.Logger.Debug("query: {@DebugInfo}", new { queryString });
return(new SearchResultSet(queryString, docs));
}