Update document

• In ES, documents are immutable
• But every document maintains a _version field
• A updated document is a copy of the document with the incremented_version number

• The old documents get marked for deletion

• POST WITH _update will only update the changed fields. If not changes are made, the document is not udpated

curl -X POST "localhost:9200/movies/_doc/109487/_update" \
  -H "Content-Type: application/json" \
  -d  '
      {
        "doc": {
          "title": "Interstellar bare"
        }
      }
      '