File info for Solr indices can fail if request is too large

[nocollier]

In order to reduce the number of requests and therefore overall time, I reworked the get_file_info to get all info for all datasets in your search. The globus search can handle this. However, if you have a lot of dataset_ids, this appears to violate the RESTapi max length and so all Solr nodes fail to return a response.