website/content/en/docs/reference/command-line-tools-reference/feature-gates/selector-index.md

title	content_type	_build	stages	removed
SelectorIndex	feature_gate	list render never false	stage defaultValue fromVersion toVersion alpha false 1.18 1.18 stage defaultValue fromVersion toVersion beta true 1.19 1.19 stage defaultValue fromVersion toVersion stable true 1.20 1.25	true

Allows label and field based indexes in API server watch cache to accelerate list operations.