You are reading the 2.x documentation. 3.x is the latest version.
Getting Started

Upgrade Guide

Upgrade from v1 to v2

There is one breaking change in v2: the search request body must now be wrapped in a search key.

Wrap the entire search body in a search key on every POST .../search call:

{
  "filters": [
    { "field": "id", "operator": ">", "value": 1 }
  ]
}