Add filter option to term suggester

[martijnvg]

Add optional filter option to term suggester, that only allows suggest options that match with the filter.

[julianhille]

What exactly is meant with that?

1. have some kind of regex, script etc filter which filters out suggestions after these are generated and reduce them
   OR
2. pre filter the documents on which the suggestions are based or even only to a "_type" in the index?

[nik9000]

Similar but not a duplicate of #3482.

[martijnvg]

@julianhille This means that a term will only be suggested, if the documents that have this term also match with the provided filter. At least one of the term's document need to be in the filter.

This can best be seen as a kind of post filtering of terms. A _type in the index could be turn into a filter.

[julianhille]

@martijnvg then this is exactly what i need. Also for the autocomplete. I was unsure about the type of filter (pre, post) because both is named filter or known in the filter context. Sorry if that was clear to anyone else.

[bigerock]

i need this as well. i think the suggestions should be responsive to your overall query including filters, etc. i'm not sure where it would make sense to suggest terms outside of these parameters. for example, if i have a movies index and i am asking for children's movies (rated G), and i search on 'frozen', i don't want the suggester to suggest some rated R movie that also happens to contain the word 'frozen'.

[clintongormley]

@bigerock Why not use the phrase suggester instead? It does everything that the term suggester does, and more. And also supports filtering - see #3482

[bigerock]

apologies, pius sent me to this link. i am actually already using a phrase suggester but it's not adhering to my filters. perhaps there's something wrong with the structure of my query.

[ppf2]

@bigerock I think it is not working in your case because NEST does not yet support this (elastic/elasticsearch-net#824). Will chat more in our existing ZD ticket.