Compatibility summary
Your India plug may fit in Estonia outlets, as both use at least one common plug type.
Plug comparison
India plug types: C D M
Estonia plug types: C F
Both countries share at least one plug type (C D M and C F), so some plugs may work without an adapter. Check your appliance.
Voltage comparison
India: 230V, 50Hz
Estonia: 230V, 50Hz
Voltage difference is within a range many devices tolerate; check your appliance label.