Write statements with their qualifiers into the cirrus search index
Each statement should be stored without qualifiers, and then separately with each qualifier
For example, on wikidata the Mona Lisa has the statement 'depicts woman' P180=Q467 and the statement 'depicts sky' P180=Q527 with the qualifiers 'applies to part background' P518=Q13217555 and 'color green' P462=Q3133.
We propose to store these in statement_keywords as follows:
'statement_keywords' : [ 'P180=Q467', 'P180=Q527', 'P180=Q527[P518=Q13217555]', 'P180=Q527[P462=Q3133]', ]
In this way the user will be able to search using the haswbstatement keyword. If they want to find items with 'depicts sky' then can search for haswbstatement:P180=Q527, where if they want to find items that depict a green sky they can search for haswbstatement:P180=Q527[P462=Q3133]