Add documentation of derived fields (#7329)

* Add documentation of derived fields

Signed-off-by: Rishabh Maurya <[email protected]>

* improve the documentation

Signed-off-by: Rishabh Maurya <[email protected]>

* Fix style-job comments

Signed-off-by: Rishabh Maurya <[email protected]>

* documentation for object derived field

Signed-off-by: Rishabh Maurya <[email protected]>

* Update one of the search request and date format documentation

Signed-off-by: Rishabh Maurya <[email protected]>

* Doc review

Signed-off-by: Fanit Kolchina <[email protected]>

* Tech review comments

Signed-off-by: Fanit Kolchina <[email protected]>

* One more passive voice

Signed-off-by: Fanit Kolchina <[email protected]>

* Apply suggestions from code review

Co-authored-by: Nathan Bower <[email protected]>
Signed-off-by: kolchfa-aws <[email protected]>

* Update _field-types/supported-field-types/derived.md

Signed-off-by: kolchfa-aws <[email protected]>

* Update _field-types/supported-field-types/derived.md

Signed-off-by: kolchfa-aws <[email protected]>

* Update _field-types/supported-field-types/derived.md

Signed-off-by: kolchfa-aws <[email protected]>

* More editorial comments

Signed-off-by: Fanit Kolchina <[email protected]>

---------

Signed-off-by: Rishabh Maurya <[email protected]>
Signed-off-by: Fanit Kolchina <[email protected]>
Signed-off-by: kolchfa-aws <[email protected]>
Co-authored-by: Fanit Kolchina <[email protected]>
Co-authored-by: kolchfa-aws <[email protected]>
Co-authored-by: Nathan Bower <[email protected]>