What was the name of the operation that led to the annexation | SSC-Steno,CGL,CHSL,CPO,MTS

What was the name of the operation that led to the annexation of Hyderabad State into India ?
उस ऑपरेशन का नाम क्या था जिसके कारण हैदराबाद राज्य का भारत में विलय हुआ?