Add sparse embedding models to list of compatible models (#2901)

(cherry picked from commit e94b4fe)

Author: davidkyle

docs/en/stack/ml/nlp/ml-nlp-model-ref.asciidoc

@@ -78,6 +78,16 @@ purposes and to get started with the Elastic {nlp} features.
 * https://huggingface.co/deepset/electra-base-squad2[Electra base squad2]
 * https://huggingface.co/deepset/tinyroberta-squad2[TinyRoBERTa squad2]
 
+[discrete]
+[[ml-nlp-model-ref-sparse-embedding]]
+== Third party sparse embedding models
+
+Sparse embedding models should be configured with the `text_expansion` task type.
+
+* https://huggingface.co/naver/splade-v3-distilbert[SPLADE-v3-DistilBERT]
+* https://huggingface.co/aken12/splade-japanese-v3[aken12/splade-japanese-v3]
+* https://huggingface.co/hotchpotch/japanese-splade-v2[hotchpotch/japanese-splade-v2]
+
 
 [discrete]
 [[ml-nlp-model-ref-text-embedding]]