Add docs explaining hnsw hyperparam tuning

[jeffchuber]

many issues relate to this

[savour-it-last]

Hello, I have gone through the various issues but seems I am now suddenly getting the issue corresponding to #868 upon using persist database. I tried updating it but I got the same issue with persist database.

[cmosguy]

@jeffchuber and @AbishekNairM I am just getting this error as well in ChromaDB. I was adding a text-embedding-ada-002 of some documents then started to encounter this issue. I do not understand why this is happening when i query from the chromaDB.

[savour-it-last]

@cmosguy So further context regarding this is:

1. This occurred ONLY when using persist db.
2. It did not malfunction immediately, initially querying the index/collection worked but once this error came all the questions gave this same error in the SAME instance where I loaded the db.
3. Deleting and recreating it removed the issue.

It is not very reproduceable as I have been using persist db for a while, it happens during the normal use of this feature but when it stops working, all queries show that output.

This is most likely an issue with the persist_db().

[aritejhg]

Hi, still facing this issue. Is there any update on this?