Welcome to the Atlassian developer community @ThomasEhmann,
How odd. That sounds like the deprecation notice about hierarchy levels; however, that notice was about 1 November 2021 and was eventually cancelled. As such, that certainly sounds like a bug, not a permanent removal.
I tried to get fields paginated using GET /rest/api/3/field/search?expand=key,lastUsed,screensCount,contextsCount,isLocked,searcherKey&query=parent
and my instance responds:
{
"maxResults": 50,
"startAt": 0,
"total": 2,
"isLast": true,
"values": [
{
"id": "parent",
"name": "Parent",
"description": "",
"key": "parent",
"isLocked": false,
"screensCount": 0,
"contextsCount": 0,
"lastUsed": {
"type": "NOT_TRACKED"
}
},
{
"id": "customfield_10016",
"name": "Parent Link",
"schema": {
"type": "any",
"custom": "com.atlassian.jpo:jpo-custom-field-parent",
"customId": 10016
},
"key": "customfield_10016",
"isLocked": true,
"searcherKey": "com.atlassian.jpo:jpo-custom-field-parent-searcher",
"screensCount": 0,
"contextsCount": 1,
"lastUsed": {
"type": "NOT_TRACKED"
}
}
]
}
What is the full context of your request? Which API endpoint?