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d5c2ce7c - [fix] create redis vector index before adding docs, add prefix to doc… (#11257)

[fix] create redis vector index before adding docs, add prefix to doc… (#11257) Fix Description: For Redis Vector integration in add_texts method, there were two issues that lead to this bug. 1. Vector index is not being created leading to no such_index error 2. `doc:index` prefix was also missing for Redis Keys. resolves #11197 Maintainer: @baskaryan --------- Co-authored-by: Bagatur <baskaryan@gmail.com>