A value from ctx not showing in alert message

Plugins Alerting
2

I think should be

ctx.monitor.inputs.search.indices #An array that contains the indices the monitor observes.

But I suggest to test this both to see wich is getting the correct values

 {{ctx.monitor.inputs.0.search.indices}} 
 {{ctx.monitor.inputs.0}}
 {{ctx.monitor.inputs.search.indices}}

I had a similar problem once with ctx.results.0.hits.hits make sure you are handling the array correctly on the body message

{{#ctx.results.0.hits.hits}}
        {{#_source.message.requestParameters.key}}
        {{/_source.message.requestParameters.key}}
        {{#_source.message.requestParameters.key}}
        {{/_source.message.requestParameters.key}}
{{/ctx.results.0.hits.hits}}

Can you show the body message?