Troublesome index settings[BUG]

[pandu-k]

Describe the bug
A 5xx was caused by creating an index with these settings

To Reproduce
Create an index with these settings:

index_settings = {
                    "index_defaults": {
                        "treat_urls_and_pointers_as_images": True,
                        "model": 'open_clip/coca_ViT-L-14/laion2b_s13b_b90k',
                        "normalize_embeddings": True,
                        "text_preprocessing": {
                            "split_length": 10,
                            "split_overlap": 2,
                            "split_method": "sentence"
                        },
                    },         
                'number_of_shards':60,
        }

[wanliAlex]

I can't reproduce the error on the mainline. maybe it's fixed in PR (#387)