More_like_this issues

Elastic Stack Elasticsearch
1

Hi guys, am not sure if the issues below are considered to be features. I
tested it on a small set of docs (inside a single index/type), thus was
able to count what should be the outputs on particular mlt queries. The
structure of queries (taken via curl) was like this:

"query" : {
"more_like_this" : {
....
}
}

Using ES 0.20.5, the issues are:

  1. min_doc_freq (probably other too) restriction is evaluated per shard;
    leading to wrong omission of some docs.

  2. min_doc_freq (probably other too) restriction is evaluated per field;
    leading to wrong inclusion of some docs.

  3. percent_terms_to_match restriction has strange (read nonsensical)
    impacts.

Best,
M.

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