When 'Show Package Indexes' Checkbox Are Checked multiple times then Assets are added continuously in Search Index Manager window

Steps to repro:
1. Create a New Project
2. Click on search Icon besides collab Icon
3. Enter "Index Manager" in the Global Search window and Select
4. 'Show Package Indexes' Checkbox > Check and Uncheck multiple times

Actual Result:
Assets are added continuously on Checking 'Show Package Indexes' Checkbox.

Expected Result:
The asset should not get added multiple times on Checking 'Show Package Indexes' Checkbox.

Reproducible in:
2021.1.0a1

Environment:
Occurring on Windows 10 & macOS 10.15.

Note: Global Search option in Editor is introduced in 2021.1.0a1