Documentation: Make video available again

[koppor]

1. Go to https://druid.apache.org/docs/latest/misc/papers-and-talks.html
2. Click on "Real-time Analytics with Open Source Technologies - Discusses Lambda architectures with Druid."
3. Page https://www.youtube.com/watch?v=kJMYVpnW_AQ opens
4. YouTube shows "This video isn't available anymore"

Wish: The video should be available again.

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Screenshot: