ETL is really database focused and batch focused , Extract, Transform, Load.

Data pipeline, is a combination of streams and batch. For example, you can implement a Data Capture using something like https://debezium.io/

Here's how Netflix solves it https://netflixtechblog.com/dblog-a-generic-change-data-capt...

Overview

"Change-Data-Capture (CDC) allows capturing committed changes from a database in real-time and propagating those changes to downstream consumers [1][2]. CDC is becoming increasingly popular for use cases that require keeping multiple heterogeneous datastores in sync (like MySQL and ElasticSearch) and addresses challenges that exist with traditional techniques like dual-writes and distributed transactions [3][4]."