Few things you could check and confirm:
1. If you plan to index every template, then do not include anything in the includeTemplate section. If this is added, then only those items would be indexed by Solr
2. Make sure the new template is not added to the excludeTemplate section
3. Check the field types in the new template. Make sure those fields are NOT added in the ExcludeField.
4. If all the above are taken care of, try reindexing and check for any errors in Solr admin console. If possible you could reload the core and check.