Assign default pipelines in monitoring index templates

[ycombinator]

Currently the Monitoring HttpExporter adds the pipeline parameter to every bulk index request:

elasticsearch/x-pack/plugin/monitoring/src/main/java/org/elasticsearch/xpack/monitoring/exporter/http/HttpExporter.java

Line 565 in 9fd4d6b

params.put("pipeline", MonitoringTemplateUtils.pipelineName(MonitoringTemplateUtils.TEMPLATE_VERSION));

Further, the pipeline name is selected using the version of the monitoring index templates (2, 6, etc.):

elasticsearch/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/monitoring/exporter/MonitoringTemplateUtils.java

Lines 112 to 114 in 9fd4d6b

	public static String pipelineName(String id) {
	return "xpack_monitoring_" + id;
	}

With #32286, we can now set the default pipeline within each monitoring index template itself and remove this bit of code.

[ycombinator]

@pickypg pointed out that the LocalExporter sets the Ingest pipeline on every index request as well:

elasticsearch/x-pack/plugin/monitoring/src/main/java/org/elasticsearch/xpack/monitoring/exporter/local/LocalBulk.java

Lines 78 to 80 in 9fd4d6b

	if (usePipeline) {
	request.setPipeline(MonitoringTemplateUtils.pipelineName(MonitoringTemplateUtils.TEMPLATE_VERSION));
	}

[dakrone]

Internal monitoring has been deprecated for quite a while, and we're no longer doing any active development on it. I'm going to close this issue.