Actual Behavior

The autoCompleteUrl for assignee, which returns whether an user is assignable, passes issueKey=null as a parameter. This doesn't make sense as we are just listing out fields for an issue to be created.

"assignee": {
    "required": false,
    "schema": {
        "type": "user",
        "system": "assignee"
    },
    "name": "Assignee",
>   "autoCompleteUrl": "https://jpalharini.jira/jira764/rest/api/latest/user/assignable/search?issueKey=null&username=",
    "hasDefaultValue": true,
    "operations": [
        "set"
    ]
}

If we run the above query with anuy value set for user, Jira returns the following.

{
    "errorMessages": [
        "The issue no longer exists."
    ],
    "errors": {}
}

Expected Behavior

The returned URL should pass project=PKEY instead.

Steps to Reproduce

1. Setup a Jira instance with at least one project;
2. Execute a GET request on the following URL, replacing <PKEY> with a valid project key and <Type> with a valid issue type;

   https://jpalharini.jira/jira764/rest/api/2/issue/createmeta?expand=projects.issuetypes.fields&issuetypeNames=<Type>&projectKeys=<PKEY>
   

Workaround

When processing the output of the above endpoint, replace issueKey with project.