rever process data_stream changes

Signed-off-by: Tetiana Kravchenko <tetiana.kravchenko@elastic.co>

packages/system/data_stream/process/fields/agent.yml

@@ -13,21 +13,18 @@
 
         Examples: AWS account id, Google Cloud ORG Id, or other unique identifier.'
       example: 666777888999
-      dimension: true
     - name: availability_zone
       level: extended
       type: keyword
       ignore_above: 1024
       description: Availability zone in which this host is running.
       example: us-east-1c
-      dimension: true
     - name: instance.id
       level: extended
       type: keyword
       ignore_above: 1024
       description: Instance ID of the host machine.
       example: i-1234567890abcdef0
-      dimension: true
     - name: instance.name
       level: extended
       type: keyword
@@ -45,14 +42,12 @@
       ignore_above: 1024
       description: Name of the cloud provider. Example values are aws, azure, gcp, or digitalocean.
       example: aws
-      dimension: true
     - name: region
       level: extended
       type: keyword
       ignore_above: 1024
       description: Region in which this host is running.
       example: us-east-1
-      dimension: true
     - name: project.id
       type: keyword
       description: Name of the project in Google Cloud.
@@ -72,7 +67,6 @@
       type: keyword
       ignore_above: 1024
       description: Unique container id.
-      dimension: true
     - name: image.name
       level: extended
       type: keyword
@@ -135,7 +129,6 @@
       level: core
       type: keyword
       ignore_above: 1024
-      dimension: true
       description: 'Name of the host.
 
         It can contain what `hostname` returns on Unix systems, the fully qualified domain name, or a name specified by the user. The sender decides which value to use.'
@@ -151,6 +144,17 @@
       ignore_above: 1024
       description: Operating system kernel version as a raw string.
       example: 4.4.0-112-generic
+    - name: os.name
+      level: extended
+      type: keyword
+      ignore_above: 1024
+      multi_fields:
+        - name: text
+          type: text
+          norms: false
+          default_field: false
+      description: Operating system name, without the version.
+      example: Mac OS X
     - name: os.platform
       level: extended
       type: keyword
@@ -193,13 +197,6 @@
   description: Process metrics.
   type: group
   fields:
-    - name: pid
-      level: core
-      type: long
-      ignore_above: 1024
-      description: 'Process id.'
-      dimension: true
-
     - name: state
       type: keyword
       description: >

packages/system/data_stream/process/fields/ecs.yml

@@ -48,6 +48,3 @@
   external: ecs
 - name: service.type
   external: ecs
-- external: ecs
-  name: agent.id
-  dimension: true

packages/system/docs/README.md

@@ -1801,7 +1801,6 @@ If running as less privileged user, it may not be able to read process data belo
 | Field | Description | Type | Unit | Metric Type |
 |---|---|---|---|---|
 | @timestamp | Event timestamp. | date |  |  |
-| agent.id | Unique identifier of this agent (if one exists). Example: For Beats this would be beat.id. | keyword |  |  |
 | cloud.account.id | The cloud account or organization id used to identify different entities in a multi-tenant environment. Examples: AWS account id, Google Cloud ORG Id, or other unique identifier. | keyword |  |  |
 | cloud.availability_zone | Availability zone in which this host is running. | keyword |  |  |
 | cloud.image.id | Image ID for the cloud instance. | keyword |  |  |