Elastic Search nested - ruby-on-rails

Question

I'm using Elastic search through tire gem.
Given this structure to index my resource model
mapping do
indexes :_id
indexes :version, analyzer: 'snowball', boost: 100
indexes :resource_files do
indexes :_id
indexes :name, analyzer: 'snowball', boost: 100
indexes :resource_file_category do
indexes :_id
indexes :name, analyzer: 'snowball', boost: 100
end
end
end
How can i retrieve all the resources that have resource_files with a given resource_file_category id?
i've looked in the elastic search docs and i think could be using the has child filter
http://www.elasticsearch.org/guide/reference/query-dsl/has-child-filter.html
i've tried this way
filter :has_child, :type => 'resource_files', :query => {:filter => {:has_child => {:type => 'resource_file_category', :query => {:filter => {:term => {'_id' => params[:resource_file_category_id]}}}}}}
but i'm not sure if is possible/valid to make a "nested has_child filter" or if is there a better/simpler way to do this... any advice is welcome ;)

Answer 1

I'm afraid I don't know what your mapping definition means. It'd be easier to read if you just posted the output of:
curl -XGET 'http://127.0.0.1:9200/YOUR_INDEX/_mapping?pretty=1'
But you probably want something like this:
curl -XGET 'http://127.0.0.1:9200/YOUR_INDEX/YOUR_TYPE/_search?pretty=1' -d '
{
"query" : {
"term" : {
"resource_files.resource_file_catagory._id" : "YOUR VALUE"
}
}
}
'
Note: The _id fields should probably be mapped as {"index": "not_analyzed"} so that they don't get analyzed, but instead store the exact value. Otherwise if you do a term query for 'FOO BAR' the doc won't be found, because the actual terms that are stored are: ['foo','bar']
Note: The has_child query is used to search for parent docs who have child docs (ie docs which specify a parent type and ID) that match certain search criteria.

Answer 2

The dot operator can be used to access nested data.
You can try something like this:
curl -XGET 'http://loclahost:port/INDEX/TYPE/_search?pretty=1' -d
'{
"query": {
"match": {
"resource_files.resource_file_catagory.name": "VALUE"
}
}
}'
If resource_file_catagory is non_analyzed the value is not tokenized and stored as a single value, hence giving you an exact match.
You can also use elasticsearch-head plugin for data validation and also query building reference.
https://www.elastic.co/guide/en/elasticsearch/reference/1.4/modules-plugins.html or
https://mobz.github.io/elasticsearch-head/