New Elasticsearch Settings

New settings introduced by this module:
A comma-separated list of host suffixes that trigger our attempt to authenticate with Elastic Cloud. Defaults to,
A comma-separated list of ports that trigger our SSL support. Defaults to 9343.
An API-key which is used to authorize this client when connecting to Elastic Cloud. API-keys are managed via the console as a list of Strings under the root level key "api_keys". Defaults to missing-api-key
Whether to accept self-signed certificates when using SSL. This is unsafe and allows for MITM-attacks, but may be useful for testing. Defaults to false.
The interval in which to send keep-alive messages. Defaults to 20s. Set to 0 to disable.