There is a command group 'az_eventgrid_namespace_topic'. This group of commands could 'manage eventgrid namespace topic'. The group of commands has global parameter '--debug' which means 'Increase logging verbosity to show all debug logs.'. The group of commands has global parameter '--help -h' which means 'Show this help message and exit.'. The group of commands has global parameter '--only-show-errors' which means 'Only show errors, suppressing warnings.'. The group of commands has global parameter '--output -o' which means 'Output format.'. The group of commands has global parameter '--query' which means 'JMESPath query string. See <a href="http://jmespath.org/">http://jmespath.org/</a> for more information and examples.'. The group of commands has global parameter '--subscription' which means 'Name or ID of subscription. You can configure the default subscription using `az account set -s NAME_OR_ID`.'. The group of commands has global parameter '--verbose' which means 'Increase logging verbosity. Use --debug for full debug logs.'. This group contains a child command 'az_eventgrid_namespace_topic_create'.The syntax is: az eventgrid namespace topic create --name
                                    --namespace-name
                                    --resource-group
                                    [--event-retention-in-days]
                                    [--input-schema {cloudeventschemav1_0}]
                                    [--no-wait {0, 1, f, false, n, no, t, true, y, yes}]
                                    [--publisher-type {custom}]. The 1th example of the child command would be to use it to 'create topic', the syntax is: az eventgrid namespace topic create -g rg -n topic --namespace-name name --event-retention-in-days 1 --publisher-type custom. The parameter '--name --topic-name -n' is required. It is used to name of the namespace topic.. The parameter '--namespace-name' is required. It is used to name of the namespace.. The parameter '--resource-group -g' is required. It is used to name of resource group. you can configure the default group using `az configure --defaults group=<name>`.. The parameter '--event-retention-in-days' is optional. event retention for the namespace topic expressed in days.. The parameter '--input-schema' is optional. this determines the format that is expected for incoming events published to the topic.. The parameter '--no-wait' is optional. do not wait for the long-running operation to finish.. The parameter '--publisher-type' is optional. publisher type of the namespace topic.. 