optimistic-concurrency-control.md

Optimistic concurrency control

Retrieve the document (and its primary term and sequence number)

GET /products/_doc/100

Update the in_stock field only if the document has not been updated since retrieving it

POST /products/_update/100?if_primary_term=X&if_seq_no=X
{
  "doc": {
    "in_stock": 123
  }
}