Elasticsearch - How to update document

Question

How does elasticsearch update document? It will delete original document and make new one? I've heard this is how nosql's updating method. does elasticsearch do, same as any other nosql db? or It will replace/insert just field which need to be?

Answer 1

For example, I'm running with Elasticsearh 7.0.0. First, I created one document,

PUT /employee/_doc/1

{
    "first_name" : "John",
    "last_name" : "Snow",
    "age" : 19,
    "about" : "King in the north",
    "sex" : "male"
}

Then I updated it via

POST /employee/_update/1/

{
    "doc": {  
        "first_name" : "Aegon",
        "last_name" : "Targaryen",
        "skill": "fighting and leading"
    }
}

Finally, I got correct result when

GET /employee/_doc/1

{
    "_index" : "employee",
    "_type" : "_doc",
    "_id" : "1",
    "_version" : 9,
    "_seq_no" : 11,
    "_primary_term" : 1,
    "found" : true,
    "_source" : {
        "first_name" : "Aegon",
        "last_name" : "Targaryen",
        "age" : 19,
        "about" : "King in the north",
        "sex" : "male",
        "skill" : "fighting and leading"
    }
}