The %{{FORMAT}} syntax breaks the helm chart

[LBoraz]

In the documentation about the sprintf format (https://www.elastic.co/guide/en/logstash/current/event-dependent-configuration.html#sprintf) it is stated that:

Instead of specifying a field name inside the curly braces, use the %{{FORMAT}} syntax where FORMAT is a java time format.

This syntax breaks the helm chart, i believe because the double curly braces are interpreted as some command to be resolved.
If the issue can't be fixed, the documentation should be at least updated with a disclaimer about the %{{FORMAT}} syntax.

See error:
Error: template: logstash/templates/statefulset.yaml:56:29: executing "logstash/templates/statefulset.yaml" at <include (print .Template.BasePath "/configmap-pipeline.yaml") .>: error calling include: template: logstash/templates/configmap-pipeline.yaml:15:3: executing "logstash/templates/configmap-pipeline.yaml" at <tpl $config $>: error calling tpl: error during tpl function execution for [...]

See line 56 in statefulset

helm-charts/logstash/templates/statefulset.yaml

Line 56 in 2fd64d0

pipelinechecksum: {{ include (print .Template.BasePath "/configmap-pipeline.yaml") . | sha256sum | trunc 63 }}