ruby - ElasticSearch - if field is null, treat as 0? -

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i using elasticsearch, , running nullpointerexceptions because field basing score on null several documents.

how make elasticsearch treat these null fields 0?

fwiw, i'm using tire gem , ruby code:

s = tire.search "articles"             query                 custom_score :script => "_score < 2 ? 0 : doc['num_likes'].value"                    match fields, keyword                 end                  end                end

i discovered need this:

_score < 2 ? 0 : (doc['num_likes'].empty ? 0 : doc['num_likes'].value)

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