Make ecs.version a constant_keyword field

Instead of adding `ecs.version` as a field in every document written by APM Server, make it a constant_keyword field and set its version in the data stream mappings. The data stream's ingest pipeline is responsible for upgrading documents to the expected format, so it follows that the integration package (ingest pipeline, mappings) should define the ECS version. We're currently pinning to a recent commit of ECS due to our reliance on the unreleased `device.*` fields. When they are released, we should update to the released version.

Author: axw

Makefile

@@ -12,6 +12,14 @@ GOTESTFLAGS?=-v
 # Prevent unintended modifications of go.[mod|sum]
 GOMODFLAG?=-mod=readonly
 
+# Define the github.com/elastic/ecs ref used for the integration package for
+# resolving ECS fields. The top-level "value" file in the repo will be used
+# for populating the `ecs.version` field added to documents.
+#
+# TODO(axw) when the device.* fields we're using have been added to a release,
+# we should pin to a release tag here.
+ECS_REF?=266cf6aa62e46bff1965342a61191ce5ffe1b0d7
+
 PYTHON_ENV?=.
 PYTHON_VENV_DIR:=$(PYTHON_ENV)/build/ve/$(shell $(GO) env GOOS)
 PYTHON_BIN:=$(PYTHON_VENV_DIR)/bin
@@ -149,6 +157,11 @@ get-version:
 # Integration package generation.
 ##############################################################################
 
+ECS_REF_FILE:=build/ecs/$(ECS_REF).txt
+$(ECS_REF_FILE):
+@mkdir -p $(@D)
+@curl --fail --silent -o $@ https://raw.githubusercontent.com/elastic/ecs/$(ECS_REF)/version
+
 build-package: build/packages/apm-$(APM_SERVER_VERSION).zip
 build-package-snapshot: build/packages/apm-$(APM_SERVER_VERSION)-preview-$(GITCOMMITTIMESTAMPUNIX).zip
 build/packages/apm-$(APM_SERVER_VERSION).zip: build/apmpackage
@@ -159,9 +172,9 @@ build/packages/apm-%.zip: $(ELASTICPACKAGE)
 .PHONY: build/apmpackage build/apmpackage-snapshot
 build/apmpackage: PACKAGE_VERSION=$(APM_SERVER_VERSION)
 build/apmpackage-snapshot: PACKAGE_VERSION=$(APM_SERVER_VERSION)-preview-$(GITCOMMITTIMESTAMPUNIX)
-build/apmpackage build/apmpackage-snapshot:
+build/apmpackage build/apmpackage-snapshot: $(ECS_REF_FILE)
 @mkdir -p $(@D) && rm -fr $@
-@$(GO) run ./apmpackage/cmd/genpackage -o $@ -version=$(PACKAGE_VERSION)
+@$(GO) run ./apmpackage/cmd/genpackage -o $@ -version=$(PACKAGE_VERSION) -ecs=$$(cat $(ECS_REF_FILE)) -ecsref=git@$(ECS_REF)
 
 ##############################################################################
 # Documentation.

NOTICE.txt

@@ -281,218 +281,6 @@ binaries that contain `-oss` in the artifact name are licensed under the Apache
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 --------------------------------------------------------------------------------
 Dependency : github.com/elastic/elastic-agent-libs
 Version: v0.2.11

apmpackage/apm/_dev/build/build.yml

@@ -1,4 +1,3 @@
 dependencies:
  ecs:
- # TODO(axw) make sure this is kept in sync with the ECS version used in libbeat.
- reference: git@main
+ reference: generated

apmpackage/apm/changelog.yml

@@ -3,9 +3,9 @@
 # change type can be one of: enhancement, bugfix, breaking-change
 - version: "generated"
  changes:
- - description: Placeholder
+ - description: Change `ecs.version` to a `constant_keyword` field
  type: enhancement
- link: https://github.com/elastic/apm-server/pull/123
+ link: https://github.com/elastic/apm-server/pull/9208
 - version: "8.5.0"
  changes:
  - description: Add package settings to enable the experimental collection of service metrics

apmpackage/apm/data_stream/app_logs/elasticsearch/ingest_pipeline/default.yml

@@ -5,3 +5,5 @@ processors:
  name: process_ppid
  - pipeline:
  name: observer_version
+ - pipeline:
+ name: ecs_version

apmpackage/apm/data_stream/app_metrics/elasticsearch/ingest_pipeline/default.yml

@@ -3,6 +3,8 @@ description: Pipeline for ingesting APM application metrics.
 processors:
  - pipeline:
  name: observer_version
+ - pipeline:
+ name: ecs_version
  - pipeline:
  name: user_agent
  - pipeline:

apmpackage/apm/data_stream/error_logs/elasticsearch/ingest_pipeline/default.yml

@@ -3,6 +3,8 @@ description: Pipeline for ingesting APM error events.
 processors:
  - pipeline:
  name: observer_version
+ - pipeline:
+ name: ecs_version
  - pipeline:
  name: user_agent
  - pipeline:

apmpackage/apm/data_stream/internal_metrics/elasticsearch/ingest_pipeline/default.yml

@@ -3,6 +3,8 @@ description: Pipeline for ingesting APM internal metrics.
 processors:
  - pipeline:
  name: observer_version
+ - pipeline:
+ name: ecs_version
  - pipeline:
  name: user_agent
  - pipeline:

apmpackage/apm/data_stream/rum_traces/elasticsearch/ingest_pipeline/default.yml

@@ -3,6 +3,8 @@ description: Pipeline for ingesting APM RUM trace events.
 processors:
  - pipeline:
  name: observer_version
+ - pipeline:
+ name: ecs_version
  - pipeline:
  name: user_agent
  - pipeline:

apmpackage/apm/data_stream/traces/elasticsearch/ingest_pipeline/apm_data_stream_migration.yml

@@ -6,6 +6,8 @@ description: |
 processors:
  - pipeline:
  name: observer_version
+ - pipeline:
+ name: ecs_version
  - pipeline:
  name: process_ppid
  - script: