facets in elastic 5.5 - database

Question

I'm trying to build a feceted search with elastic 5.5 (With elastic 2.* I found information on how to do this but in 5.5 I can't)
Not something unusual, store-like items that i want to show hint of the amount if the user will choose to filter using some property. Image for visualisation
Data set example:
[
{
"id" : "978-0641723445",
"cat" : ["book","hardcover"],
"name" : "The Lightning Thief",
"author" : "Rick Riordan",
"series_t" : "Percy Jackson and the Olympians",
"sequence_i" : 1,
"genre_s" : "fantasy",
"inStock" : true,
"price" : 12.50,
"pages_i" : 384
}
,
{
"id" : "978-1423103349",
"cat" : ["book","paperback"],
"name" : "The Sea of Monsters",
"author" : "Rick Riordan",
"series_t" : "Percy Jackson and the Olympians",
"sequence_i" : 2,
"genre_s" : "fantasy",
"inStock" : true,
"price" : 6.49,
"pages_i" : 304
}
,
{
"id" : "978-1857995879",
"cat" : ["book","paperback"],
"name" : "Sophie's World : The Greek Philosophers",
"author" : "Jostein Gaarder",
"sequence_i" : 1,
"genre_s" : "fantasy",
"inStock" : true,
"price" : 3.07,
"pages_i" : 64
}
,
{
"id" : "978-1933988177",
"cat" : ["book","paperback"],
"name" : "Lucene in Action, Second Edition",
"author" : "Michael McCandless",
"sequence_i" : 1,
"genre_s" : "IT",
"inStock" : true,
"price" : 30.50,
"pages_i" : 475
}
]
Thanks!

Answer 1

You just have to use aggs instead of facets. Aggregations are much more powerful than facets.
For example:
GET index/_search
{
"aggs" : {
"countries" : {
"terms" : { "field" : "country" }
},
"types" : {
"terms" : { "field" : "type" }
}
}
}
Then if a user click on a "facet", just add a filter clause within a bool query (this will update all facet counts) or add a post_filter to just filter the results (does not affect aggregations).

Answer 2

if the column is text, you will need to use ".keyword" too to handle cases of country names where there are many words ("El Salvador", "United States of America", etc)
GET index/_search
{
"aggs" : {
"countries" : {
"terms" : { "field" : "country.keyword" }
}
}
}