[UI] Clicking on a doc from FTS search results doesnt open the doc in mixed mode cluster

Build : 7.0.0-5016

Steps :
1. Create a 2-node cluster running 6.6.2-9588 with kv+n1ql+index+fts on both the nodes
2. Install all 3 sample buckets
3. Create 2 FTS indexes and confirm that running queries from the UI return some results.
4. Swap rebalance one node from the cluster with a spare node running 7.0.0-5016 with same services.
5. Run the same queries from both the nodes.
6. Click on some result from the 6.6.2 node - doc should get opened up in Document Editor
7. Click on some result from the 7.0 node - doc will not get opened.

Seeing Error 400 in the inspect window for the following URL :
http://172.23.107.142:8091/pools/default/buckets/beer-sample/scopes/_default/collections/_default/docs/tommyknocker_brewery_and_pub-maple_nut_brown_ale_ale

See attached screenshot.