Retrieve inner_hits when searching multiple kNN fields in same nested document

Elastic Stack Elasticsearch
3

@Jasper_Simon actually, I think it might be OK. But I need to add some documentation.

Could you try specifying a unique "name" field for each of your inner_hits objects? Something like:

{
  "knn": [
    {
      "field": "paragraphs.titleEmbedding",
      "query_vector": [
        0.1, 0.2
      ],
      "k": 20,
      "num_candidates": 50,
      "inner_hits": {
		"name": "title",
        "_source": [
          "paragraphs.documentTitle"
        ],
        "fields": [
          "paragraphs.documentTitle"
        ]
      }
    },
    {
      "field": "paragraphs.textEmbedding",
      "query_vector": [
        0.1, 0.2
      ],
      "k": 20,
      "num_candidates": 50,
      "inner_hits": {
		"name": "text",
        "_source": [
          "paragraphs.documentText"
        ],
        "fields": [
          "paragraphs.documentText"
        ]
      }
    }
  ]
}

I think the issue is that we attempt to automatically name the inner_hit to appropriately extract the correct field information given a configuration. However, we have no way of distinguishing these inner_hit configurations.