I have documents in ElasticSearch with the following structure :
"_source": {
"last_updated": "2017-10-25T18:33:51.434706",
"country": "Italia",
"price": [
"€ 139",
"€ 125",
"€ 120",
"€ 108"
],
"max_occupancy": [
2,
2,
1,
1
],
"type": [
"Type 1",
"Type 1 - (Tag)",
"Type 2",
"Type 2 (Tag)",
],
"availability": [
10,
10,
10,
10
],
"size": [
"26 m²",
"35 m²",
"47 m²",
"31 m²"
]
}
}
Basically, the details records are split in 5 arrays, and fields of the same record have the same index position in the 5 arrays. As can be seen in the example data there are 5 array(price, max_occupancy, type, availability, size) that are containing values related to the same element. I want to extract the element that has max_occupancy field greater or equal than 2 (if there is no record with 2 grab a 3 if there is no 3 grab a four, ...), with the lower price, in this case the record and place the result into a new JSON object like the following :
{
"last_updated": "2017-10-25T18:33:51.434706",
"country": "Italia",
"price: ": "€ 125",
"max_occupancy": "2",
"type": "Type 1 - (Tag)",
"availability": 10,
"size": "35 m²"
}
Basically the result structure should show the extracted record(that in this case is the second index of all array), and add the general information to it(fields : "last_updated", "country").
Is it possible to extract such a result from elastic search? What kind of query do I need to perform?
Could someone suggest the best approach?
My best approach: go nested with Nested Datatype
Except for easier querying, it easier to read and understand the connections between those objects that are, currently, scattered in different arrays.
Yes, if you'll decide this approach you will have to edit your mapping and re-index your entire data.
How would the mapping is going to look like? something like this:
{
"mappings": {
"properties": {
"last_updated": {
"type": "date"
},
"country": {
"type": "string"
},
"records": {
"type": "nested",
"properties": {
"price": {
"type": "string"
},
"max_occupancy": {
"type": "long"
},
"type": {
"type": "string"
},
"availability": {
"type": "long"
},
"size": {
"type": "string"
}
}
}
}
}
}
EDIT: New document structure (containing nested documents) -
{
"last_updated": "2017-10-25T18:33:51.434706",
"country": "Italia",
"records": [
{
"price": "€ 139",
"max_occupancy": 2,
"type": "Type 1",
"availability": 10,
"size": "26 m²"
},
{
"price": "€ 125",
"max_occupancy": 2,
"type": "Type 1 - (Tag)",
"availability": 10,
"size": "35 m²"
},
{
"price": "€ 120",
"max_occupancy": 1,
"type": "Type 2",
"availability": 10,
"size": "47 m²"
},
{
"price": "€ 108",
"max_occupancy": 1,
"type": "Type 2 (Tag)",
"availability": 10,
"size": "31 m²"
}
]
}
Now, its more easy to query for any specific condition with Nested Query and Inner Hits. for example:
{
"_source": [
"last_updated",
"country"
],
"query": {
"bool": {
"must": [
{
"term": {
"country": "Italia"
}
},
{
"nested": {
"path": "records",
"query": {
"bool": {
"must": [
{
"range": {
"records.max_occupancy": {
"gte": 2
}
}
}
]
}
},
"inner_hits": {
"sort": {
"records.price": "asc"
},
"size": 1
}
}
}
]
}
}
}
Conditions are: Italia AND max_occupancy > 2.
Inner hits: sort by price ascending order and get the first result.
Hope you'll find it useful
Related
We use enterprise search indexes to store items that can be tagged by multiple tenants.
e.g
[
{
"id": 1,
"name": "document 1",
"tags": [
{ "company_id": 1, "tag_id": 1, "tag_name": "bla" },
{ "company_id": 2, "tag_id": 1, "tag_name": "bla" }
]
}
]
I'm looking to find a way to retrieve all documents with only the tags of company 1
This request:
{
"query": "",
"facets": {
"tags": {
"type": "value"
}
},
"sort": {
"created": "desc"
},
"page": {
"size": 20,
"current": 1
}
}
Is coming back with
...
"facets": {
"tags": [
{
"type": "value",
"data": [
{
"value": "{\"company_id\":1,\"tag_id\":1,\"tag_name\":\"bla\"}",
"count": 1
},
{
"value": "{\"company_id\":2,\"tag_id\":1,\"tag_name\":\"bla\"}",
"count": 1
}
]
}
],
}
...
Can I modify the request in a way such that I get no tags by "company_id" = 2 ?
I have a solution that involves modifying the results to strip the extra data after they are retrieved but I'm looking for a better solution.
I want to sort objects in ascending order but the sort doesn't work.
Here is a sort query below.
"sort":[
{
"category.position": {
"order":"asc",
"mode":"min",
"nested": {
"path": "category",
"filter": {
"term": {"category_category_id":42} }
}
}
}]
And here are the objects below.
"name": "Yeti",
"category": [
{
"category_id": 42,
"name": "Raamiga",
"position": 3
},
],
"name": "Venus",
"category": [
{
"category_id": 42,
"name": "Raamiga",
"position": 4
}
],
Please, help! Many thanks in advance!
Solved. There was a typo… Must be "category.category_id" indtead of "category_category_id".
I'm working with elasticsearch Query dsl, and I can't find a way to express the following:
Return results that have the field "price" > min budget and have "price" < max Budget and have has_price=true and also return all results that have "has_price=false"
In other words, I would like to use a range filter on results only that have has_price field set to true, otherwise, on results that have has_price set to false don't take in consideration the filter
Here's the mapping:
{
"formations": {
"mappings": {
"properties": {
"code": {
"type": "text"
},
"date": {
"type": "date",
"format": "dd/MM/yyyy"
},
"description": {
"type": "text"
},
"has_price": {
"type": "boolean"
},
"place": {
"type": "text"
},
"price": {
"type": "float"
},
"title": {
"type": "text"
}
}
}
}
}
The following query combines the 2 scenarios as 2 should clauses in a bool-query. And as there are only should clauses, minimum_should_match will be 1, meaning that at least one should-clause has to match:
Abstract Code Snippet
GET formations/_search
{
"query": {
"bool": {
"should": [
{ <1st scenario: has_price = false> },
{ <2nd scenario> has_price = true AND price IN budget_range}
]
}
}
}
Actual Sample Code Snippets
# 1. Create the index and populate it with some sample documents
POST formations/_bulk
{"index": {"_id": 1}}
{"has_price": true, "price": 2.0}
{"index": {"_id": 2}}
{"has_price": true, "price": 3.0}
{"index": {"_id": 3}}
{"has_price": true, "price": 4.0}
{"index": {"_id": 4}}
{"has_price": false, "price": 2.0}
{"index": {"_id": 5}}
{"has_price": false, "price": 3.0}
{"index": {"_id": 6}}
{"has_price": false, "price": 4.0}
# 2. Query assuming min_budget = 2.0 and max_budget = 4.0
GET formations/_search
{
"query": {
"bool": {
"should": [
{
"bool": {
"filter": {
"term": {
"has_price": false
}
}
}
},
{
"bool": {
"filter": [
{
"term": {
"has_price": true
}
},
{
"range": {
"price": {
"gt": 2,
"lt": 4
}
}
}
]
}
}
]
}
}
}
# 3. Result Snippet (4 hits: 3 from 1st scenario & 1 from 2nd scenario)
"hits" : {
"total" : {
"value" : 4,
"relation" : "eq"
},
...
Don't forget to add the Claus "minimum_should_match": 1 to your bool-query in case you add another non-should-clause to your bool-query.
Let me know if this answers your question & solves your issue.
I have an object which looks something like this:
{
"id": 123,
"language_id": 1,
"label": "Pablo de la Pena",
"office": {
"count": 2,
"data": [
{
"id": 1234,
"is_office_lead": false,
"office": {
"id": 1,
"address_line_1": "123 Main Street",
"address_line_2": "London",
"address_line_3": "",
"address_line_4": "UK",
"address_postcode": "E1 2BC",
"city_id": 1
}
},
{
"id": 5678,
"is_office_lead": false,
"office": {
"id": 2,
"address_line_1": "77 High Road",
"address_line_2": "Edinburgh",
"address_line_3": "",
"address_line_4": "UK",
"address_postcode": "EH1 2DE",
"city_id": 2
}
}
]
},
"primary_office": {
"id": 1,
"address_line_1": "123 Main Street",
"address_line_2": "London",
"address_line_3": "",
"address_line_4": "UK",
"address_postcode": "E1 2BC",
"city_id": 1
}
}
My Elasticsearch mapping looks like this:
"mappings": {
"item": {
"properties": {
"office": {
"properties": {
"data": {
"type": "nested",
}
}
}
}
}
}
My Elasticsearch query looks something like this:
GET consultant/item/_search
{
"from": 0,
"size": 24,
"query": {
"bool": {
"must": [
{
"term": {
"language_id": 1
}
},
{
"term": {
"office.data.office.city_id": 1
}
}
]
}
}
}
This returns zero results, however, if I remove the second term and leave it only with the language_id clause, then it works as expected.
I'm sure this is down to a misunderstading on my part of how the nested object is flattened, but I'm out of ideas - I've tried all kinds of permutations of the query and mappings.
Any guidance hugely appreciated. I am using Elasticsearch 6.1.1.
I'm not sure if you need the entire record or not, this solution gives every record that has language_id: 1 and has an office.data.office.id: 1 value.
GET consultant/item/_search
{
"from": 0,
"size": 100,
"query": {
"bool":{
"must": [
{
"term": {
"language_id": {
"value": 1
}
}
},
{
"nested": {
"path": "office.data",
"query": {
"match": {
"office.data.office.city_id": 1
}
}
}
}
]
}
}
}
I put 3 different records in my test index for proofing against false hits, one with different language_id and one with different office ids and only the matching one returned.
If you only need the office data, then that's a bit different but still solvable.
I'm trying to perform some sorting based on the attributes of a document's deeply nested children.
Let's say we have an index filled with publisher documents. A publisher has a collection of books, and
each book has a title, a published flag, and a collection of genre scores. A genre_score represents how well
a particular book matches a particular genre, or in this case a genre_id.
First, let's define some mappings (for simplicity, we will only be explicit about the nested types):
curl -XPUT 'localhost:9200/book_index' -d '
{
"mappings": {
"publisher": {
"properties": {
"books": {
"type": "nested",
"properties": {
"genre_scores": {
"type": "nested"
}
}
}
}
}
}
}'
Here are our two publishers:
curl -XPUT 'localhost:9200/book_index/publisher/1' -d '
{
"name": "Best Books Publishing",
"books": [
{
"name": "Published with medium genre_id of 1",
"published": true,
"genre_scores": [
{ "genre_id": 1, "score": 50 },
{ "genre_id": 2, "score": 15 }
]
}
]
}'
curl -XPUT 'localhost:9200/book_index/publisher/2' -d '
{
"name": "Puffin Publishers",
"books": [
{
"name": "Published book with low genre_id of 1",
"published": true,
"genre_scores": [
{ "genre_id": 1, "score": 10 },
{ "genre_id": 4, "score": 10 }
]
},
{
"name": "Unpublished book with high genre_id of 1",
"published": false,
"genre_scores": [
{ "genre_id": 1, "score": 100 },
{ "genre_id": 2, "score": 35 }
]
}
]
}'
And here is the final definition of our index & mappings...
curl -XGET 'localhost:9200/book_index/_mappings?pretty=true'
...
{
"book_index": {
"mappings": {
"publisher": {
"properties": {
"books": {
"type": "nested",
"properties": {
"genre_scores": {
"type": "nested",
"properties": {
"genre_id": {
"type": "long"
},
"score": {
"type": "long"
}
}
},
"name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"published": {
"type": "boolean"
}
}
},
"name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
}
}
}
}
Now suppose we want to query for a list of publishers, and have them sorted by those who books performing
well in a particular genre. In other words, sort the publishers by the genre_score.score of one of their books
for the target genre_id.
We might write a search query like this...
curl -XGET 'localhost:9200/book_index/_search?pretty=true' -d '
{
"size": 5,
"from": 0,
"sort": [
{
"books.genre_scores.score": {
"order": "desc",
"nested_path": "books.genre_scores",
"nested_filter": {
"term": {
"books.genre_scores.genre_id": 1
}
}
}
}
],
"_source":false,
"query": {
"nested": {
"path": "books",
"query": {
"bool": {
"must": []
}
},
"inner_hits": {
"size": 5,
"sort": []
}
}
}
}'
Which correctly returns the Puffin (with a sort value of [100]) first and Best Books second (with a sort value of [50]).
But suppose we only want to consider books for which published is true. This would change our expectation to have Best Books first (with a sort of [50]) and Puffin second (with a sort of [10]).
Let's update our nested_filter and query to the following...
curl -XGET 'localhost:9200/book_index/_search?pretty=true' -d '
{
"size": 5,
"from": 0,
"sort": [
{
"books.genre_scores.score": {
"order": "desc",
"nested_path": "books.genre_scores",
"nested_filter": {
"bool": {
"must": [
{
"term": {
"books.genre_scores.genre_id": 1
}
}, {
"term": {
"books.published": true
}
}
]
}
}
}
}
],
"_source": false,
"query": {
"nested": {
"path": "books",
"query": {
"term": {
"books.published": true
}
},
"inner_hits": {
"size": 5,
"sort": []
}
}
}
}'
Suddenly, our sort values for both publishers has become [-9223372036854775808].
Why does adding an additional term to our nested_filter in the top-level sort have this impact?
Can anyone provide some insight as to why this behavior is happening? And additionally, if there are any viable solutions to the proposed query/sort?
This occurs in both ES1.x and ES5
Thanks!