Connection selector

Connection selector is a simple class used to select a connection from a list of currently live connection instances. Initially, it is passed a dictionary containing all the connections options which it can then use during the selection process. When the select method is called it is given a list of currently live connections to choose from.

The options dictionary is passed to Transport as the hosts parameter and the same is used to construct the connection object itself. When the connection was created based on information retrieved from the cluster via the sniffing process, it is the dictionary returned by the host_info_callback.

Example of where this might be useful is a zone-aware selector that would only select connections from its own zones and only fall back to other connections where there would be none in its zones.

For reference information, refer to the full Elasticsearch Python documentation.