dspace_statistics_api/indexer.py: Use `fl` parameter

I forgot to add the fl parameter to the downloads function.

README.md

@@ -1,5 +1,5 @@
 # DSpace Statistics API [![Build Status](https://ci.mjanja.ch/api/badges/alanorth/dspace-statistics-api/status.svg?ref=refs/heads/v6_x)](https://ci.mjanja.ch/alanorth/dspace-statistics-api) [![builds.sr.ht status](https://builds.sr.ht/~alanorth/dspace-statistics-api.svg)](https://builds.sr.ht/~alanorth/dspace-statistics-api?)
-DSpace stores item view and download events in a Solr "statistics" core. This information is available for use in the various DSpace user interfaces, but is not exposed externally via any APIs. The DSpace 4/5/6 [REST API](https://wiki.lyrasis.org/display/DSDOC5x/REST+API), for example, only exposes information about communities, collections, item metadata, and bitstreams.
+DSpace stores item view and download events in a Solr "statistics" core. This information is available for use in the various DSpace user interfaces, but is not exposed externally via any APIs. The DSpace 4/5/6 [REST API](https://wiki.lyrasis.org/display/DSDOC5x/REST+API), for example, only exposes _metadata_ about communities, collections, items, and bitstreams.
 
 - If your DSpace is version 4 or 5, use [dspace-statistics-api v1.1.1](https://github.com/ilri/dspace-statistics-api/releases/tag/v1.1.1)
 - If your DSpace is version 6+, use [dspace-statistics-api v1.2.0 or greater](https://github.com/ilri/dspace-statistics-api/releases/tag/v1.2.0)

dspace_statistics_api/indexer.py

@@ -130,6 +130,7 @@ def index_downloads():
     solr_query_params = {
         "q": "type:0",
         "fq": "-isBot:true AND statistics_type:view AND bundleName:ORIGINAL",
+        "fl": "owningItem",
         "facet": "true",
         "facet.field": "owningItem",
         "facet.mincount": 1,
@@ -176,6 +177,7 @@ def index_downloads():
                 solr_query_params = {
                     "q": "type:0",
                     "fq": "-isBot:true AND statistics_type:view AND bundleName:ORIGINAL",
+                    "fl": "owningItem",
                     "facet": "true",
                     "facet.field": "owningItem",
                     "facet.mincount": 1,