在Elasticsearch Nest中索引动态对象

Question

Elastic search generally works with pre-defined classes . How do I work with dynamic classes. eg: Suppose I want to search a particular field then

var result = clientConnection.Search<**TicketData**>(

s => s
.Aggregations(

a => a
    .DateRange(

"L1", d => d
        .Field(p => p.timestamp)
            .Ranges(
            r => r.To("2016-10-09T15:01:06+00:00"),
            r => r.From("2016-09-27T02:09:17+00:00")
        )
    )
)
);

Here the ticketdata class has to be defined beforehand. Can we have something like

var result = clientConnection.Search<ANYDYNAMICCLASS>(s => s

.Aggregations(a => a

.DateRange("L1", d => d

.Field(p => p.timestamp)

           .Ranges(
            r => r.To("2016-10-09T15:01:06+00:00"),
            r => r.From("2016-09-27T02:09:17+00:00")
        )
    )
)
);

Can a dynamic class/ dynamic object work with this ? please give an example how it can be done.

Answer 1

Elasticsearch works with JSON documents, it's not tied to C# POCOs. With a strongly typed language like C# however, it makes a lot of sense to model documents in Elasticsearch as POCOs in your application but you don't have to.

For example, we could use dynamic as the document type to search, and use the .Index() and .Type() methods to specify the indices and types, respectively

var result = client.Search<dynamic>(s => s
    .Index("index-name")
    .Type("type-name")
    .Aggregations(a => a
        .DateRange("L1", d => d
            .Field("timestamp")
            .Ranges(
                r => r.To("2016-10-09T15:01:06+00:00"),
                r => r.From("2016-09-27T02:09:17+00:00")
            )
        )
    )

);

You can also work with Elasticsearch.Net directly through the .LowLevel property on the client and work with streams, bytes or strings as well.