Optional descendingQuery parameter to specify whether to return the documents in descending by key order.
Optional feedQuery parameter to specify the changes feed type.
Optional headersOptional heartbeatQuery parameter to specify the period in milliseconds after which an empty line is sent in the results. Off
 by default and only applicable for
 continuous and eventsource feeds. Overrides any timeout to keep the feed alive indefinitely. May also be
 true to use a value of 60000.
 Note: Delivery of heartbeats cannot be relied on at specific intervals. If your application runs in an
 environment where idle network connections may break, heartbeat is not suitable as a keepalive mechanism.
 Instead, consider one of the following options:
timeout parameter with a value that is compatible with your network environment.normal or longpoll).Optional limitQuery parameter to specify the number of returned documents to limit the result to.
Optional sinceQuery parameter to specify to start the results from the change immediately after the given update sequence.
 Can be a valid update sequence or now value. Default is 0 i.e. all changes.
Optional timeoutQuery parameter to specify the maximum period in milliseconds to wait for a change before the response is
 sent, even if there are no results. Only applicable for longpoll or continuous feeds. Default value is
 specified by httpd/changes_timeout configuration option. Note that 60000 value is also the default maximum
 timeout to prevent undetected dead connections.
Parameters for the
getDbUpdatesoperation.