Can We Have Weekly Index creation?

[jije-r]

Problem

We are currently having large number of index created on the daily bases, can we have configuration for creating index's on weekly basis. So that we could reduce more index bump out errors.
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Steps to replicate

Provide example config and message

Expected Behavior or What you need to ask

Currently index are created as custom-index-yyyy-mm-dd
it would be encourage to have similar to below
Custom-index-yyyy-ww
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Using Fluentd and ES plugin versions

• OS version
• Fluentd v0.12 or v0.14/v1.0
  • paste result of fluentd --version or td-agent --version
• AWS ES Service plugin version
  • paste boot log of fluentd or td-agent
  • paste result of fluent-gem list, td-agent-gem list or your Gemfile.lock
• IAM policies for AWS ES Service (optional)
• ES version (optional)