* rename model parameter in the openai doc embedder
* fix tests for openai doc embedder
* rename model parameter in the openai text embedder
* fix tests for openai text embedder
* rename model parameter in the st doc embedder
* fix tests for st doc embedder
* rename model parameter in the st backend
* fix tests for st backend
* rename model parameter in the st text embedder
* fix tests for st text embedder
* fix docstring
* fix pipeline utils
* fix e2e
* reno
* fix the indexing pipeline _create_embedder function
* fix e2e eval rag pipeline
* pytest
* support single metadata dict in markdown2document
* reno
* unwrap list
* direct key access
* typing
* add example of indexing pipeline using Multiplexer
* reno
* replace metadata w meta in tests/examples
* do not touch already broken e2e tests
* Revert "do not touch already broken e2e tests"
This reverts commit 1f911920d98954b57daacfe8d8ed02fd77d136db.