Execute KNN approximate search using OpenSearch Java client

Question

I am trying to execute KNN approximate search using the OpenSearch Java client. I cant find any example nor documentation about it (both high-level and low-level clients).

I am able to execute the command from the OpenSearch dashboard. For example:

GET contentml-images-clip-batch1/_search
{
  "size": 2,
  "query": {
    "knn": {
      "embedding": {
        "vector": [1,2,3],
        "k": 2
      }
    }
  }
}

Any good reference for how to achieve the sam call using one of the Java clients?