Rather than failing the request, when a node with node.ingest set to false receives an index or bulk request with a pipeline id, it should try to redirect the request to another node with node.ingest set to true. If there are no node with ingest set to true based on the current cluster state, an exception will be returned and the request will fail. Note that in case there are no ingest nodes and bulk has a pipeline id specified only for a subset of index requests, the whole bulk will fail.
Now that the ingest infra is part of es core we can remove some code that was required by the plugin and have a better integration with es core. We allow to specify the pipeline id in bulk and index as a request parameter, we have a REST filter that parses it and adds it to the relevant action request. That is not required anymore, as we can add this logic to RestIndexAction and RestBulkAction directly, no need for a filter. Also, we can allow to specify a pipeline id for each index requests in a bulk request. The small downside of this is that the ingest filter has to go over each item of a bulk request, all the time, to figure out whether they have a pipeline id.
CRUD and simulate apis work now fine, every node has the pipelines in memory, but node.ingest disables ingestion, meaning that any index or bulk request with a pipeline id is going to fail
Martijn van Groningen
javanna