How to build a bulk request to post multiple values on a dense_vector field

Elastic Stack Elasticsearch
1

I have a document describing a video in which there are multiple frames/images.
The use case is to find the video containing frames/images similar to a given image.
An image embedding is computed on each Frame/image and stored in a dense_vector field named Frame_vector.
To index this with a bulk request, I have to store multiple values in a single dense_vector field

To do this, logically I should post a JSONArray of JSONArray / Jagged array / array of array to the dense_vector field Frame_vector.

Here is my Bulk request:

2024/04/24 16:46:32 347-qesjsp-null-DEBUG-QESHost_elastic81-bulkProcess()	: bulkJsonRequest::{"index":{"_index":"mediasearch","_id":"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця.xml"}}
"Frame":["uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_0.jpg",
"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_1.jpg",
"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_2.jpg",
"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_3.jpg",
"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_4.jpg",
"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_5.jpg",
"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_6.jpg",
"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_7.jpg",
"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_8.jpg",
"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця_Frame_9.jpg"],
"Frame_desc":["a woman in a black shirt and a white tank top",
"a man is looking at a computer screen",
"a man in a blue shirt is smiling",
"a man standing next to a man with a microphone",
"a man in a blue shirt holding a blue and white object",
"a man in a suit and tie standing in front of a microphone",
"a man standing next to a giant clock",
"a man holding a game controller in his hand",
"a man standing next to a large fish in a mirror",
"two men in military uniforms sitting on a couch"],
"Frame_vector":[
[-0.3481926918029785,-0.13305401802062988,.........,0.98209947645664215,-0.9743254542350769],
[-0.4481926918029785,-0.23305401802062988,.........,0.88209947645664215,-0.3743254542350769],
[-0.5481926918029785,-0.33305401802062988,.........,0.78209947645664215,-0.3743254542350769],
[-0.6481926918029785,-0.43305401802062988,.........,0.68209947645664215,-0.5743254542350769],
[-0.7481926918029785,-0.53305401802062988,.........,0.58209947645664215,-0.3743254542350769],
[-0.8481926918029785,-0.63305401802062988,.........,0.48209947645664215,-0.0743254542350769],
[-0.9481926918029785,-0.63305401802062988,.........,0.38209947645664215,-0.3743254542350769],
[-0.0481926918029785,-0.73305401802062988,.........,0.28209947645664215,-0.3743254542350769],
[-0.1481926918029785,-0.73305401802062988,.........,0.18209947645664215,-0.6743254542350769],
[-0.2481926918029785,-0.03305401802062988,.........,0.08209947645664215,-0.3743254542350769]
]
}

Here is what I get as a response:

2024/04/24 16:46:32 872-qesjsp-null-ERROR-ElasticApiService-parseBulkResponse()	: Erreur dans le Bulk:{"took":64,"items":[{"index":{"_index":"mediasearch","_id":"uk/Віталіи_Кім_про_виклики_у_перші_дні_вторгнення_Миколаівськии_Ваньок_та_мотивацію_Хоробрі_серця.xml","error":{"reason":"[1:11814] failed to parse: Failed to parse object: expecting token of type [VALUE_NUMBER] but found [START_ARRAY]","caused_by":{"reason":"Failed to parse object: expecting token of type [VALUE_NUMBER] but found [START_ARRAY]","col":11814,"line":1,"type":"parsing_exception"},"type":"document_parsing_exception"},"status":400}}],"errors":true}

Is this even possible ?
Am I wrong with my assertion : array of array ?

Thank you for your help

2

You would need to use nested fields IMO. If supported as I never tested that.

What is the mapping?

Otherwise you should denormalize and index frames one by one instead. Which would probably have my preference.

3

How do you plan on searching for it? Similarity searching for a particular frame in the video?

As @dadoonet mentioned, nested dense vector query would be a good candidate

Docs
Search Labs article with mappings for dense_vector

Joe

4

A response from dadoonet the great : I feel very flattered :slight_smile: ....
.. and it is fully accurate as ever.

nested fields seems the definitive solution.

Since it has been marked as evil for performances , I never looked into it, but here, I have no choice.

With that in mind, I did a new research and found this previous issue:

(How to search Multiple dense vector fields, including nested filelds)

Everything is in it. mine is a poor duplicate.

Thank you, you both, for your valuable help.

Please close.

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5

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