NOTE: I think it would be best if the elasticsearch didn't generate
any HTML at all.

In order to be sure that child / parent relation is set

[search_helpers] has_child query added to should instead of replacing the bool query (combine results)

[test] only check composed search doesn't crash, the query is too unstable to maintain tests for now

[optimisation] cwuri need to be in RQL, otherwise it *really* slows down the indexing when cw accesses entity.cw_uri.

Update using entity.cw_attr_cache should be enough, no need to loop over attributes again

eid is already selected via 'V is `Etype`'