I am using `Map`<`String , String>` data structure to store my values in hazelcast . My values look like this after storing it in hazelcast.
I am using this structure `IMap`<`String, Map`<`String, String>`

`key value`

`key1 {FNAME=Stev, LNAME =Austin ACTIVE_STATUS=1}`

`key2 {FNAME=John, LNAME =Cena ACTIVE_STATUS=1}`

`key3 {FNAME=Rock, LNAME =Johnson ACTIVE_STATUS=1}`

My Requirement : I have to update FNAME field value without retrieving whole Map and again overriding it.

I tried it using put and replace method but it is overriding whole map value.