How to update a document using script? (es_version=8.4.3, javaApi)

[infinite-war]

config

elasticsearch 8.4.3 (javaApi)
JDK 17

created index

PUT testdb
{
  "mappings": {
    "properties": {
      "name":{
        "type":"text"
      },
      "desc":{
        "type":"text"
      },
      "score":{
        "type": "integer"
      }
    }
  }
}

PUT testdb/_doc/1
{
  "name": "bookA",
  "desc": "a desc",
  "score":36305
}


PUT testdb/_doc/2
{
  "name": "bookB",
  "desc":"a desc",
  "score": 1000
}

question

Now I want to add 125 points to bookB's score , the request statement should be like this

POST testdb/_update/2
{
  "script":"ctx._source.score+=125"
}

here I use a script to make an add operation for bookB's score , and actually it works.

However, I want to create this request statement by javaApi ,how can I do this?(I haven't found a solution in elasticsearch's docs yet)