Advanced Elasticsearch 7.0

Indexing a document

You can index a document with an _id or without it. Elasticsearch will automatically generate one for you if the _id field is not filled:

• Indexing with _id: The following code block describes the syntax of indexing a document with an identifier:

PUT /{index}/_doc/{_id}

Let's specify _id as 1 to create an ACWF ETF document in the cf_etf index, as shown in the following screenshot:

In the response body, the aforementioned metadata is index name (_index: cf_etf), mapping type (_type: _doc), and the document identifier (_id: 1). Besides, there is a bit more metadata, such as the version number (_version), the sequence ...