Join query in ElasticSearch

Question

Is there any way (query) to join 2 JSONs below in ElasticSearch

{
product_id: \"1111\",
price: \"23.56\",
stock: \"100\"
}

{
product_id: \"1111\",
category:         


        

Answer 1

isaac.hazan's answer works quite well, but I would like to add a few points that helped me with this kind of situation:

I landed on this page when I was trying to solve a similar problem, in that I had to exclude multiple records of one index based on documents of another index. The lack of relationships is one of the main downsides of unstructured databases.

The elasticsearch documentation page on Handling Relationships explains a lot.

Four common techniques are used to manage relational data in Elasticsearch:

• Application-side joins
• Data denormalization
• Nested objects
• Parent/child relationships

Often the final solution will require a mixture of a few of these techniques.

I've used nested objects and application-side joins, mostly. While using the same field name could momentarily solve the problem, I think it is better to rethink and create best-suited mapping for your application.

For instance, you might find that you want to list all products with price greater than x, or list all products that are not in stock anymore. To deal with such scenarios it helps if you are using one of the solutions mentioned above.