I need to insert data into a custom solr index using code without creating any sitecore items.
Here's my scenario, I am fetching data from a service every 12 hours which on each call it returns nearly 20k rows of data. among this data there are updated information and new information. What i'm trying to do is to directly add/update these data to a custom index in solr without creating bucket items in sitecore since it takes more than an hour to add/update those 20k rows of data to the sitecore bucket.
I'm using sitecore 9 update 2.
Thank you in advance,