Add again querystring config for target index

app/properties_configuration/config/groups.yml

@@ -139,6 +139,9 @@ chembl_target:
     optional: ['tax_id', 'species_group_flag']
   references:
     default: ['cross_references']
+  querystring:
+    default: [ 'target_chembl_id', 'pref_name', 'uniprot_accessions', 'target_type', 'organism',
+               '_metadata.related_compounds.count', '_metadata.related_activities.count', 'tax_id', 'species_group_flag' ]
 chembl_document:
   download:
     default: ['document_chembl_id', 'journal_full_title', 'src_id', '_metadata.source', 'title', 'pubmed_id', 'doi',