Change Search API to store data in SOLR

Hi,

I am trying to utilize Sarnia. On the installation page of that module it states:
https://www.drupal.org/node/1379476#installation

"For generating sample Solr data, ApacheSolr is preferred over Search API. When indexing data, Solr can be configured to index data without storing it; Search API makes the decision to index most data using Solr but to not store it (make it retrievable from Solr), while ApacheSolr stores all of the data that it indexes. In short, a Solr core generated using Search API will contain very little retrievable data, while a core generated using ApacheSolr will allow you to retrieve all properties from the core--the use case that Sarnia was built to address."

I am not sure if this "decision to index, but not store data" is made in Search API or Search API Solr. In any case, is it possible to overwrite this decision so that Search API functions similarly to ApacheSolr, i.e. the data is stored in Solr and retrievable?

Thanks, J.