fix swagger for indexer-service

All Submissions:

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• [YES] Have you added an explanation of what your changes do and why you'd like us to include them?

Fix the swagger page issue: Update the new end point for swagger-ui used by springfox version 3.0.0

• [YES] I have updated the documentation accordingly.
• [YES] My code follows the code style of this project.

Current Behavior or Linked Issues

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issue-47

Does this introduce a breaking change?

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• [NO]

Other information

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