Can an ElasticSearch ingest pipeline use a search template as its script?
Specifically, I'd like to configure an ingest pipeline so that whenever data of a particular type come in, we query ElasticSearch for some related data, and populate a field (or fields) on the original data based on the results, before loading it in.
I see that ingest pipelines can use scripts (https://www.elastic.co/guide/en/elasticsearch/reference/master/script-processor.html), and that scripts can include search templates (https://www.elastic.co/guide/en/elasticsearch/reference/master/modules-scripting-using.html), but I haven't been able to find any information on potentially combining the two.