I'd like to use moreLikeThis query on Elasticsearch using NEST library and give different boost values for each match.
var moreLikeThis = _elastic.Search<Report>(s => s
.From(0)
.Size(10)
.Query(q => q
.Filtered(f => f
.Query(fq => fq
.Dismax(dmx => dmx
.TieBreaker(0.7)
.Queries(qr => qr
.MoreLikeThis(mlt => mlt
.OnFields(of => of.Title.Suffix("stemmed"))
.MinTermFrequency(1)
.MaxQueryTerms(12)
.Boost(20)
.Documents(docs => docs
.Document() // This is the part where I'm stuck
)
), qr => qr
.MoreLikeThis(mlt => mlt
.OnFields(of => of.Title.Suffix("synonym"))
.MinTermFrequency(1)
.MaxQueryTerms(12)
.Boost(10)
)
)
)
)
)
)
);
This the query I'm stuck at. I can write this easily in raw JSON format, but that's not what I'm aiming for. I'm quite new in both C# and NEST and do not know how to pass documentId there.
That's my class, if it helps at all :
[ElasticType(IdProperty = "_id", Name = "reports")]
public class Report
{
[ElasticProperty(Name = "_id", Type = FieldType.String)]
public string _id { get; set; }
[ElasticProperty(Name = "Title", Type = FieldType.String)]
public string Title { get; set; }
}
And that's the query I'm using as JSON and it works just fine.
{
"from": 0,
"size": 10,
"fields": ["Title"],
"query": {
"filtered": {
"query": {
"dis_max": {
"tie_breaker": 0.7,
"queries": [
{
"more_like_this": {
"fields": ["Title.stemmed"],
"docs": [
{
"_index": "test",
"_type": "reports",
"_id": "68753"
}
],
"min_term_freq": 1,
"max_query_terms": 12
}
}, {
"more_like_this": {
"fields": ["Title.synonym"],
"docs": [
{
"_index": "test",
"_type": "reports",
"_id": "68753"
}
],
"min_term_freq": 1,
"max_query_terms": 12
}
}
]
}
}
}
}
}
Documentation in NEST doesn't explain or give a basic idea how this is done.
Thank you.
