Once ORES articletopic data is in HDFS (via T240553: Consume ORES articletopic data from Kafka and store it in HDFS), the bulk ElasticSearch update job needs to be modified to handle it.
Initially, only enwiki has articletopic data, and we want to fake it for other wikis by using the data from the English interwiki. The bulk update job might or might not be the right place for that (cf T240517#5734191).