Add support for specifying a constant_keyword value (#194)

andrewkroh · web-flow · commit b358e974b7f9 · 2021-06-23T11:22:22.000-04:00
For the `constant_keyword` field type Elasticsearch allows for the value to be specified in the mapping. If the value is not specified in the mapping then the value is set based on the first document that is indexed. Package data streams will be able to explicitly declare a constant_keyword value and will not have to include the field with every document sent. https://www.elastic.co/guide/en/elasticsearch//reference/7.12/keyword.html#constant-keyword-params
diff --git a/code/go/internal/spec/statik.go b/code/go/internal/spec/statik.go
diff --git a/test/packages/good/data_stream/foo/fields/external-fields.yml b/test/packages/good/data_stream/foo/fields/external-fields.yml
@@ -3,4 +3,4 @@
   description: Event family
   fields:
     - name: category
-      external: ecs
+      external: ecs
diff --git a/test/packages/good/data_stream/foo/fields/some_fields.yml b/test/packages/good/data_stream/foo/fields/some_fields.yml
@@ -32,3 +32,6 @@
 - name: dynamic_histogram
   type: histogram
   dynamic_template: true
+- name: vehicle_type
+  type: constant_keyword
+  value: truck
diff --git a/versions/1/changelog.yml b/versions/1/changelog.yml
@@ -144,4 +144,7 @@
     link: https://github.com/elastic/package-spec/pull/191
   - description: Improve semantic versioning for version integrity
     type: enhancement
-    link: https://github.com/elastic/package-spec/pull/193
+    link: https://github.com/elastic/package-spec/pull/193
+  - description: Introduce "value" property for constant_keyword fields
+    type: enhancement
+    link: https://github.com/elastic/package-spec/pull/194
diff --git a/versions/1/data_stream/fields/fields.spec.yml b/versions/1/data_stream/fields/fields.spec.yml
@@ -54,6 +54,9 @@ spec:
       description:
         description: Short description of field
         type: string
+      value:
+        description: The value to associate with a constant_keyword field.
+        type: string
       metric_type:
         description: Metric type
         type: string
