Elasticsearch: _id based on document field? - elasticsearch

Question

I am new to Elasticsearch. I have difficulty in using a field of the document for _id. Here is my mapping:
{
"product": {
"_id": {
"path": "id"
},
"properties": {
"id": {
"type": "long",
"index": "not_analyzed",
"store": "yes"
},
"title": {
"type": "string",
"analyzer": "snowball",
"store": "no",
"index": "not_analyzed"
}
}
}
}
Here is a sample document:
{
"id": 1,
"title": "All Quiet on the Western Front"
}
When indexing this document, I got something like:
{
"_index": "myindex",
"_type": "book",
"_id": "PZQu4rocRy60hO2seUEziQ",
"_version": 1,
"created": true
}
Did I do anything wrong? How should this work?

Answer 1

EDIT: _id.path was deprecated in v1.5 and removed in v2.0.
EDIT 2: on versions where this is supported, there is a performance penalty in that the coordinating node is forced to parse all requests (including bulk) in order to determine the correct primary shard for each document.
Provide an _id.path in your mapping, as described here:
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/mapping-id-field.html
Here is a full, working demonstration:
#!/bin/sh
echo "--- delete index"
curl -X DELETE 'http://localhost:9200/so_id_from_field/'
echo "--- create index and put mapping into place"
curl -XPUT http://localhost:9200/so_id_from_field/?pretty=true -d '{
"mappings": {
"tweet" : {
"_id" : {
"path" : "post_id"
},
"properties": {
"post_id": {
"type": "string"
},
"nickname": {
"type": "string"
}
}
}
},
"settings" : {
"number_of_shards" : 1,
"number_of_replicas" : 0
}
}'
echo "--- index some tweets by POSTing"
curl -XPOST http://localhost:9200/so_id_from_field/tweet -d '{
"post_id": "1305668",
"nickname": "Uncle of the month club"
}'
curl -XPOST http://localhost:9200/so_id_from_field/tweet -d '{
"post_id": "blarger",
"nickname": "Hurry up and spend my money"
}'
curl -XPOST http://localhost:9200/so_id_from_field/tweet -d '{
"post_id": "9",
"nickname": "Who is the guy with the shoe hat?"
}'
echo "--- get the tweets"
curl -XGET http://localhost:9200/so_id_from_field/tweet/1305668?pretty=true
curl -XGET http://localhost:9200/so_id_from_field/tweet/blarger?pretty=true
curl -XGET http://localhost:9200/so_id_from_field/tweet/9?pretty=true