Add space flexibility for nested queries

Type of change

• [Yes] Bug Fix
• Feature

Please provide link to gitlab issue or ADR(Architecture Decision Record)
Search service issue 65

Does this introduce a change in the core logic?

• [NO]

Does this introduce a breaking change?

• [NO]

What is the current behavior?

• Space should be present between , and ( for nested search
• Space should not be present between "d" of nested and (

What is the new/expected behavior?

The query should be parsed irrespective of spaces.

Have you added/updated Unit Tests and Integration Tests?

Yes

Any other useful information