ElasticSearch NEST 批量插入

Question

I conducted the following piece of code which performs partial update to the Content field in existing documents:

var partials = new object[]
            {
                new{
                Id = 1337,
                Content = "test"
            }
            };

            var response = await _elastic.BulkAsync(b => b
                .Index(indexName)
                                         .Index(indexName)
                                         .UpdateMany(partials, (bu, d) => bu.Doc(d))
                                         );

However, I want to upsert this document if it does not exist and I'm not sure how. I tried to change bu.Doc to bu.Upsert however it expects a script.

Answer 1

Doc() and Upsert() work the same as described in the elastic "Update API" documentation: https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-update.html

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With Doc() you specify a partial document to update an existing document. This is not an upsert, only an update

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With Upsert() the documentation states:

If the document does not already exist, the contents of the upsert element are inserted as a new document. If the document exists, the script is executed

So the upsert part specifies what happens if the document does not exist. You need to add a script which is executed against the existing document.

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There is also the doc_as_upsert field in conjunction with doc . If set to true, then the document in doc is inserted if it does not exist, else it is updated. You can set it with bu.DocAsUpsert()