ElasticsearchEmbeddingRetriever (v2)

[ZanSara]

Blocked by:

• Implement Embedders components (2.0) #5312
• ElasticsearchDocumentStore (v2) #5327

---

Note: Let's explore the vector search capabilities of ES8 for this component!

Minimal draft API:

@component
class ElasticsearchEmbeddingRetriever(StoreAwareComponent):

    class Input:
        queries: List[np.ndarray]
        filters: Dict[str, Any]
        top_k: int
        scale_score: bool
        stores: Dict[str, Any]

    class Output:
        documents: List[Document])
    ....

[masci]

Blocked on #5945