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[fulltext] GIN indexes - OR search

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Is it possible to have 2 gin indexes and OR the search of them? 
Problem is, I need to search 5 columns and there is limitation of only 4
weights, so I want to have one index of 4 vectors and second index of 1
vector and need to OR the search.
When I try to search them separately, or use AND, it works, but for OR
EXPLAIN ANALYZE shows me, it does seq scan. 

Thank you.
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