Create or update mapping in elasticsearch

问题:

I am new to Elasticsearch and am currently working on implementing a geo_distance filter for searching. As of now my index has the following mapping (I've removed some fields):

{
advert_index: {
   mappings: {
      advert_type: {
         properties: {
            __v: {
               type: "long"
            },
            caption: {
               type: "string"
            },
            category: {
               type: "string"
            },
            **location: {
            type: "long"
            },**

         }
      }
   }
}

The geo_distance field is going to be implemented on the location field, where an example instance looks like this:

"location": [
               71,
               60
            ],

I.e. is on geoJSON format [lon, lat].

I understand that I will have to update my index so that the location field is of type geo_point, as described in the documentation (mapping-geo-point). It seems like I have to drop the index and create a new one, but I am not able to do this.

Am I on the right track? I would greatly appreciate it if anyone could help me with how I could create a new index or update my existing one with the correct data type.

Many thanks!

回答1:

Generally speaking, you can update your index mapping using the put mapping api (reference here) :

curl -XPUT 'http://localhost:9200/advert_index/_mapping/advert_type' -d '
{
    "advert_type" : {
        "properties" : {

          //your new mapping properties

        }
    }
}
'

It's especially useful for adding new fields. However, in your case, you will try to change the location type, which will cause a conflict and prevent the new mapping from being used.

You could use the put mapping api to add another property containing the location as a lat/lon array, but you won't be able to update the previous location field itself.

Finally, you will have to reindex your data for your new mapping to be taken into account.

The best solution would really be to create a new index.

If your problem with creating another index is downtime, you should take a look at aliases to make things go smoothly.

回答2:

Please note that there is a mistake in the url provided in this answer:

For a PUT mapping request: the url should be as follows:

http://localhost:9200/name_of_index/_mappings/document_type

and NOT

http://localhost:9200/name_of_index/document_type/_mappings