[FEATURE] Skip running indexing-only preparation logic when we don't want to do indexing (e.g. query only)

[badmonster0]

What is the use case?
e.g. in a process, users may only need to run queries without performing any indexing. In this case, we should skip indexing path setup logic (e.g. load a model to parse PDF) - they may be very slow.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.