How to create alias for dynamic fields in elasticsearch dynamic templates? - elasticsearch

Question

I am using elasticsearch 1.0.2 and using a sample dynamic template in my index. Is there anyway we can derive the field index name from a part of dynamic field Name
This is my template
{"dynamic_templates":[
"dyn_string_fields": {
"match": "dyn_string_*",
"match_mapping_type": "string",
"mapping": {
"type": "string",
"index" : "analyzed",
"index_name": "{name}"
}
}
}]}
The dynamic templates work and I am able to add fields. Our goal is to add fields with the "dyn_string_" prefix but while searching it should be just the fieldname without the "dyn_string_" prefix. I tested using match_mapping_type to add fields but this will allow any field to be added. Does someone have any suggestions?
I looked at Elasticsearch API and they have a transform feature in 1.3 which allows to modify the document before insertion.(unfortunately I will not be able to upgrade to that version.)

Answer 1

In single template several aliases can be set. For quick example please have a look at this dummy example:
curl -XPUT localhost:9200/_template/test_template -d '
{
"template" : "test_*",
"settings" : {
"number_of_shards" : 4
},
"aliases" : {
"name_for_alias" : {}
},
"mappings" : {
"type" : {
"properties" : {
"id" : {
"type" : "integer",
"include_in_all" : false
},
"test_user_id" : {
"type" : "integer",
"include_in_all" : false
}
}
}
}
}
'
There "name_for_alias" is you simple alias. As parameter there can be defined preset filters if you want use alias for filtering data.
More information can be found here: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices-templates.html