[Feature Request] Explain System Ingest Pipeline #18253
Description
Is your feature request related to a problem? Please describe
This is an follow up item for the system ingest pipeline feature. The system ingest pipeline is a feature to allow plugins to systematically add ingest processors based on the index mapping. The system ingest pipeline is invisible to users and it's not easy for them to understand what system ingest processors are included in the system ingest pipeline and how it works.
Describe the solution you'd like
We may want to create a new API to support explaining the system ingest pipeline. The input can be the index configuration and the output will include what system ingest processors will be created in the system ingest pipeline. Also can include the info of the function of the system ingest processors.
Related component
Indexing
Describe alternatives you've considered
No response
Additional context
The system ingest pipeline is introduced by this #17817
And for now we only have one system ingest processor supported by the neural plugin.