Keep track of errors occuring in the process in the index

[bhermann]

Is your feature request related to a problem? Please describe.
When the indexing of a component fails for various reasons (e.g., missing JAR) the error should be added to the component in the index such that mitigation strategies can pick that component up later.

Describe the solution you'd like
As an error occurs it is added to an error list for the component. It can either be kept attached to the component or as a different type inside the elasticsearch index.

Describe alternatives you've considered
none

Additional context
none