fix: error syntax in log-standard-template

[JongminChung]

Description

otel-logs-pipeline:
  workers: 5
  delay: 10
  source:
    pipeline:
      name: "otlp-pipeline"
  buffer:
    bounded_blocking:
  sink:
    - opensearch:
        hosts: OPENSEARCH_HOSTS
        username: OPENSEARCH_USER
        password: OPENSEARCH_PASSWORD
        insecure: true
        index_type: log-analytics-plain
        template_type: index-template  <-- 

Issues Resolved

Resolves #6646

In addition, if i create an index template from v1 on the current opensearch dashboard, the template is not visible.

Accordingly, I think it would be good to remove v1 as shown in the issue. (#3059 )

before

after

Check List

• New functionality includes testing.
• New functionality has a documentation issue. Please link to it in this PR.
  • New functionality has javadoc added
• Commits are signed with a real name per the DCO

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[dlvenable]

Thank you @JongminChung for this contribution!