Add has_index()

[rohanshah18]

Problem

Currently, users can not easily check if an index exists or not. The .names() iterator on the list_indexes response object is not super discoverable.

Solution

Add has_index() which internally calls describe_index() and returns true if the index exists, false otherwise.

Type of Change

• New feature (non-breaking change which adds functionality)

Test Plan

Added integration tests.

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[jhamon]

I left some feedback to fix, but overall great job putting together your first PR in python :)

[jhamon]

Looks great! 🚢