Paella 8: searching in subtitles doesn't work (Paella findCaptionsPlugin)

[snoesberger]

Describe the bug
The es.upv.paella.findCaptionsPlugin doesn't work correctly for Paella 8. After activating the plugin, the binoculars symbol appears in the playback bar. However, when I click on the symbol, no subtitles are displayed:

This worked in Paella 7 and is working in Opencast with Paella 8. Therefore, I assume there is a problem with the ILIAS plugin.

To Reproduce
Steps to reproduce the behavior:

1. Activate the es.upv.paella.findCaptionsPlugin in the Paella Player 8 config

       "es.upv.paella.findCaptionsPlugin": {
            "enabled": true,
            "side": "right",
            "order": 10
        },

2. Play an Opencast video which includes subtitles
3. Click on the binocular symbol
4. See empty list

Environment (please complete the following information):

• ILIAS version: 10
• Plugin version: 10.2.1
• Opencast version 20

[ferishili]

ReviewApp:

• release_9: https://oc-pr-575.opencast.k8s.sr.solutions/
• release_10: https://oc-pr-574.opencast.k8s.sr.solutions/

[dagraf]

My testresults:

• release_10: Successful. Subtitles can be searched.
• release_9: When trying to play a video (by clicking on "Play") the following error is thrown:

[dagraf]

Update: Tests of release_9 are now successful, too. Therefore, I move this issue to "In review".