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Documents often require updating — fields need to be incremented, modified, overwritten, or deleted. In this section we'll discuss situations where you:

1. know the ID of the doc in question and want to update only that particular document
2. want to update a group of documents that have something in common (i.e. match a query)

Use Case 1: Single-doc Updates

I'm tracking visits to my site based on the slug. A sample entry in my site_visits index:

POST site_visits/_doc/home_id
{
  "slug": "/home",
  "visits": 0,
  "tags": ["landing", "ab_test_100"],
  "unneeded_attribute": "old"
}

How do I

• add a modified_at field and set it to now
• increment the visits count
• remove the ab_test_100 tag
• and delete the unneeded attribute?

Approach to #1

For adding new fields such as modified_at, you may be tempted to repeat the POST call from above with only the new field being present:

POST site_visits/_doc/home_id
{
  "modified_at": "2020-12-05T14:11:41.634Z"
}