Elasticsearch: update existing document by inserting elements to its array fields

Elastic Stack Elasticsearch
1

Consider the following document

{
  "title":  "My first blog entry",
  "text":   "Starting to get the hang of this...",
  "tags": [ "testing" ], 
  "views":  0 
}

I need to run kind of an upsert operation. If I encounter data like

{
    "id": 1,
    "tags": [ "new tag" ]
}

I want to update the existing document with same id. So result should be :

{
    "id": 1,
    "title":  "My first blog entry",
    "text":   "Starting to get the hang of this...",
    "tags": [ "testing", "new tag" ], 
    "views":  0 
}

If the document with same id does not exist, I want to create a new one.

In Solr I could do this using Atomic updates. Is there a way to do this in Elasticsearch using Bulk API in Java?