I'm trying to import a sqlserver database to ES with jdbc river but the import process is very slow. In the logs I see that the process is doing the import 1 by 1:
new bulk [58] of [1 items], 1 outstanding bulk requests
bulk [58] success [1 items] [116ms]
new bulk [59] of [1 items], 1 outstanding bulk requests
bulk [59] success [1 items]
How can I speed up the process?