[UPDATE]: it is an interesting (and pretty uncalled for) effect: it seems to be a displaying problem. If I edit the Query DSL then it displays wrong but does the search.
However it was failing for me since Discover » Details » Filter for value (aka +) uses the plain field instead of field.keyword and the former cannot search for "=>", but as it turned out the keyword subfield indeed can.
So I see two (or three) problems here:
-> and like gets displayed incorrectly
Expanded document shows fields (that is okay) but filters for them instead of field.keyword, which may result a non-working search
some search on field doesn't work which works on field.keyword. I guess this is not a bug, since I believe that's the way it works, but this creates weird effects for the first two cases.
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