默认索引的 Elasticsearch NEST 文档计数

Question

I am using NEST for Elasticsearch 6 and would like to get the number of documents for the default index.

The documentation refers to the 1.1 version of the API which no longer seems to work.

I have created the connection settings using a default index:

var connectionSettings = new ConnectionSettings().DefaultIndex("test_docs");

When I try the code from the 1.1 api documentation:

var result = client.Count();

I get the following error:

The type arguments for method 'ElasticClient.Count(Func, ICountRequest>)' cannot be inferred from the usage. Try specifying the type arguments explicitly.

When I supply a type it is appended to the path. For example:

client.Count<TestDocument>();

Generates a URL of http://localhost:9200/test_docs/testdocument/_count when what I really need is http://localhost:9200/test_docs/_count

Answer 1

You can use

var countResponse = client.Count<TestDocument>(c => c.AllTypes());

which will call the API

GET http://localhost:9200/test_docs/_count

Answer 2

For those needing the new way of doing this (like myself). I would use the following to get a count from a specific index.

var countRequest = new CountRequest(Indices.Index("videos"));
long count = (await _ecClient.CountAsync(countRequest)).Count;