New tutorial for: configurable elasticsearchdocumentstore

[agemagician]

Describe the tutorial you would like to see here
All the current tutorials assume the document store will not change over time.

For example, assume we have a single elastic database engine and need to build a single application where each user should ask a question and retrieve an answer. However, each user should have access to a different index "database" on the elastic search.
The current implementation assumes a fixed document store information during application run-time, like :
https://github.com/deepset-ai/haystack-tutorials/blob/main/tutorials/03_Scalable_QA_System.ipynb

It would be beneficial to have a tutorial where we can change the document store username, password, and index during application runtime. Otherwise, we must build a duplicate application for each user and each index.

Additional context
None

[X] I've checked the existing tutorials

[bilgeyucel]

Hi @agemagician 👋 thank you for opening the issue. You have a nice problem here. Unfortunately, you cannot change username and password during the runtime. You can change the index but it will require re-connecting every time you change it.
I would recommend creating different DocumentStores rather than changing the credentials altogether. Another idea could be using metadata filtering and let Elastic handle the user management.