Update lib/logstash/inputs/elasticsearch/cursor_tracker.rb

Co-authored-by: Joel Andritsch <[email protected]>

Author: jsvd

lib/logstash/inputs/elasticsearch/cursor_tracker.rb

@@ -49,7 +49,7 @@ def record_last_value(event)
     end
 
     def inject_cursor(query_json)
-      query_json.gsub(":last_value", @last_value)
+      query_json.gsub(":last_value", @last_value.to_s)
     end
   end
 end; end; end