…IndexDescriptors (#2772)

* Register system index descriptors through SystemIndexPlugin.getSystemIndexDescriptors

Signed-off-by: Craig Perkins <cwperx@amazon.com>

* Add Spark Buffer index pattern

Signed-off-by: Craig Perkins <cwperx@amazon.com>

* Upgrade to checkout v4

Signed-off-by: Craig Perkins <cwperx@amazon.com>

* Fix CI issues

Signed-off-by: Craig Perkins <cwperx@amazon.com>

* Move env

Signed-off-by: Craig Perkins <cwperx@amazon.com>

* Revert "Upgrade to checkout v4"

This reverts commit b35573b.

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Signed-off-by: Craig Perkins <cwperx@amazon.com>
Signed-off-by: Derek Ho <dxho@amazon.com>
Co-authored-by: Derek Ho <dxho@amazon.com>
(cherry picked from commit d3ecb2d)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

…/backport-2772-to-2.x

…/backport-2772-to-2.x