Upgrade Sentence Transformers and Transformers

[davidkyle]

Sentence Transformers v5 adds support for sparse embedding models. v5 is now necessary for importing sparse models such as https://huggingface.co/naver/splade-v3-distilbert, without the upgrade the import fails with a ModuleNotFoundError

# Get the latest eland
docker pull docker.elastic.co/eland/eland:9.0.1

docker run -it --rm --network host docker.elastic.co/eland/eland:9.0.1 \
    eland_import_hub_model \
      --url 'http://host.docker.internal:9200/' \
      -u elastic-admin -p elastic-password \
      --hub-model-id 'naver/splade-v3-distilbert' \
      --task-type text_expansion --insecure

ModuleNotFoundError: No module named 'sentence_transformers.sparse_encoder'

A test has been added to cover this failure.

The previous requirements for Sentence Transformers was >=2.1.0,<=2.7.0 making the change to v5 a big leap but versions 3, 4, 5 have all been released in the last 12 months.

The version of Transformers is also updated to the latest release.

[pquentin]

Thanks! LGTM.