Can't set different values to the same field in different documents using updateByQuery


Using elasticsearch-7.5.2 with NEST client I'm trying to iterate through all documents in an update_by_query request and set different values to the same field (called wcf) in each doc.

My code looks like this:

var task = ElasticClient.UpdateByQuery<LogLine>(u => u.Index("test")
                .Query(q => q
                .Script(d => d
                    .Source("for (int i = 0; i < 7; i++) {ctx._source.wcf=i;}").Lang("painless")));

This code just updates all documents 7 times and I end up with all documents having the same value for the 'wcf' field while what I am actually looking for is to have the first document's 'wcf' field with value '0', the second with value '1' etc'.

Hope someone could assist me with this.

Thanks in advance!

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