search API - statistics metadata?

[umbrellaassociates]

Search API currently only returns results and pages properties.

there is no place to add additional contextual data to the results.

Some PDP implementation may want to add additional statistics data on the result set, like

• number of total records (e.g. for pagination)
• query-related profiling data (e.g. database response time)

This could be done either in a dedicated 'statistics' attribute, or a more general 'context' attribute.

[davidjbrossard]

@umbrellaassociates can you put together a proposal?

[davidjbrossard]

See parent issue for comments.
The metadata endpoint could specify which statistics are provided.

[davidjbrossard]

• We need to specify supported fields (result set size)
• We need to allow extensions through profiles

[ogazitt]

See my comment on #229