[fluentd-elasticsearch] fix service template rendering

[alexsn]

Issue triggered when defining any service port as .Capabilities cannot be evaluated inside a range loop.

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] DCO signed
• [x] Chart Version bumped (if the pr is an update to an existing chart)
• [x] Title of the PR starts with chart name (e.g. [fluentd-elasticsearch])