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The {{es}} API is large and is organized into feature groups, as can be seen in the {{es}} API documentation.
The Java API Client follows this structure: feature groups are called “namespaces”, and each namespace is located in a subpackage of co.elastic.clients.elasticsearch.
Each of the namespace clients can be accessed from the top level {{es}} client. The only exceptions are the “search” and “document” APIs which are located in the core subpackage and can be accessed on the main {{es}} client object.
The snippet below shows how to use the indices namespace client to create an index (the lambda syntax is explained in Building API objects):
// Create the "products" index
ElasticsearchClient client = ...
client.indices().create(c -> c.index("products"));Namespace clients are very lightweight objects that can be created on the fly.