Top Clicks in App Search (Enterprise search) doesn't link documents to its engine

[jimyhse]

Kibana version: 8.2.0

Elasticsearch version: 8.2.0

Server OS version: Ubuntu 20.04.4 LTS

Browser version: Google Chrome

Browser OS version: Windows 11

Original install method (e.g. download page, yum, from source, etc.): ECK (docker.elastic.co/eck/eck-operator:2.1.0)

Describe the bug:
Top Clicks in App Search (Enterprise search) doesn't link documents to its engine

Steps to reproduce:

1. Create a new engine
2. Index some documents
3. Register a click for a indexed document and a query
4. Navigate to the Analytics view for the engine
5. Click on the search term matching the query in step 3
6. Click on the document (from step 3)
7. You will now se an error message "No engine with name 'undefined' could be found."

Expected behavior:
The engine slug should be a part of document link so the document can be opened.

Screenshots (if relevant):

Errors in browser console (if relevant):
https://kibana-dev.myh.se/internal/app_search/engines/myhse-local/analytics/queries/rocky?start=2022-08-18&end=2022-08-24
{"allTags":["All Analytics Tags","test"],"analyticsUnavailable":false,"currentTag":"All Analytics Tags","endDate":"2022-08-24","logRetentionSettings":{"enabled":true,"disabled_at":null,"retention_policy":{"is_default":true,"min_age_days":180}},"query":"rocky","queriesPerDayForQuery":[0,0,0,0,0,0,0],"startDate":"2022-08-18","totalQueriesForQuery":0,"topClicksForQuery":[{"key":"park_rocky-mountain","doc_count":1,"tags":["test"],"document":{"search_index":"myhse-local","id":"park_rocky-mountain"}}]}

https://kibana-dev.myh.se/internal/app_search/engines/undefined
{"statusCode":404,"error":"Not Found","message":"Not Found","attributes":{"errors":["Not Found"]}}

Provide logs and/or server output (if relevant):
Info logs from Kibana:

[app-server][INFO]: [4cb86821-1d93-41e2-8e0c-02037867ddd4] Started GET "/as/engines/myhse-local/analytics/query/rocky?start=2022-08-18&end=2022-08-24"
[action_controller][INFO]:   Parameters: {"start"=>"2022-08-18", "end"=>"2022-08-24", "engine_slug"=>"myhse-local", "query"=>"rocky"}

Any additional context:

[jimyhse]

Hi, we've upgraded the ECK stack to 8.4.1 and bug is gone. The document links are now rendered correctly.
You can close the issue.