How to create unique constraint in Elasticsearch database?

Question

I am using elasticsearch as a document database and each record I create has a guid id that the system uses for the record id. Business people want to offer a feature to let

Answer 1

One solution will be to use uniqueId field value for specifying document ID and use op_type=create while storing the documents in ES. With this you can make sure your uniqueId field will have unique value and will not be overridden by another same valued document.

For this, the elasticsearch document says:

The index operation also accepts an op_type that can be used to force a create operation, allowing for "put-if-absent" behavior. When create is used, the index operation will fail if a document by that id already exists in the index.

Here is an example of using the op_type parameter:

$ curl -XPUT 'http://localhost:9200/es_index/es_type/unique_a?op_type=create' -d  '{
    "user" : "kimchy",
    "uniqueId" : "unique_a"
}'

If you run the above request it is ok, but running it the next time will give you an error.