Heya,
Full gist is here : https://gist.github.com/3007168
Let's say I have a document like this :
{
"id":"212468504455168001",
"location":{
"lat":46.20715933,
"lon":6.14494212
},
"lat":46.20715933,
"lng":6.14494212,
"path":"1022232003013110123223112",
"created_at":1339491413
}
I defined first an analyzer and a mapping for field path:
"analyzer":{
"myanalyzer":{
"type":"custom",
"tokenizer":"mytokenizer"
}
},
"tokenizer":{
"mytokenizer":{
"type":"edgeNGram",
"min_gram":"1",
"max_gram":"25",
"side":"front"
}
}
Then I defined a mapping for field path:
"path":{"type":"string", "analyzer":"myanalyzer"}
As you can see, I apply a EdgeNGram on path field. So my path is broken in
25 tokens like : 1,10,102,1022,...,1022232003013110123223112
My need is now to compute facets on this field as a key, but only for tokens
with a size of x (x depends to the user).
So if x is 4, I want to compute on the first 4 characters of my path.
My facet is :
"path_lat":{
"terms_stats":{
"key_field":"path",
"value_field":"lat",
"size":0
},
"facet_filter":{
"geo_bounding_box":{
"location":{
"top_left":{ "lat":84.4740645845916, "lon":-179.999999 },
"bottom_right":{ "lat":-75.67219739055291, "lon":179.999999 }
}
}
}
}
My concern is that I get facets for the 25 tokens for each document (see
result : https://gist.github.com/3007168#file_result.json
https://gist.github.com/3007168#file_result.json). But, I only need to
compute facet on the edgeNGram with a length of 4.
I imagine that I can create a multifield value with 25 fields (path_1 to
path_25) and applying each time a edgeNGram with a min/max:1,min/max:2, .,
min/max:25 and then apply my facet on field path_4 for example, but is there
a fancier way to do it ?
Thanks for your help
I hope that my description is clear enough :-/
Cheers
David.
