Add entity to the top level namespaces in which it's being used (#2556)

Add entity to the top level namespace of which it's used in sub-types.

For example, we want user.target.entity fields to be present. user.entity itself is a user type, so entity must be reused on the user type.

This also removes custom generator code which was being used to workaround the fact that this wasn't true before.

Author: mjwolf

docs/reference/ecs-cloud.md

@@ -41,9 +41,9 @@ Note also that the `cloud` fields may be used directly at the root of the events
 
 | Location | Field Set | Description |
 | --- | --- | --- |
+| `cloud.entity.*` | [entity](/reference/ecs-entity.md) | Fields to describe various types of entities across IT environments. |
 | `cloud.origin.*` | [cloud](/reference/ecs-cloud.md) | Provides the cloud information of the origin entity in case of an incoming request or event. |
 | `cloud.target.*` | [cloud](/reference/ecs-cloud.md) | Provides the cloud information of the target entity in case of an outgoing request or event. |
-| `cloud.target.entity.*` | [entity](/reference/ecs-entity.md) | Entity information for the target cloud entity. |
 
 ### Cloud field usage [_cloud_field_usage]
 

docs/reference/ecs-entity.md

@@ -33,9 +33,10 @@ The entity fields provide a standardized way to represent and categorize differe
 
 The `entity` fields are expected to be nested at:
 
-* `cloud.target.entity`
+* `cloud.entity`
 * `host.entity`
-* `service.target.entity`
-* `user.target.entity`
+* `orchestrator.entity`
+* `service.entity`
+* `user.entity`
 
 Note also that the `entity` fields are not expected to be used directly at the root of the events.

docs/reference/ecs-orchestrator.md

@@ -32,3 +32,8 @@ Fields that describe the resources which container orchestrators manage or act u
 | $$$field-orchestrator-type$$$ [orchestrator.type](#field-orchestrator-type) | Orchestrator cluster type (e.g. kubernetes, nomad or cloudfoundry).<br><br>type: keyword<br><br>example: `kubernetes` | extended |
 
 
+### Field sets that can be nested under Orchestrator [ecs-orchestrator-nestings]
+
+| Location | Field Set | Description |
+| --- | --- | --- |
+| `orchestrator.entity.*` | [entity](/reference/ecs-entity.md) | Fields to describe various types of entities across IT environments. |

docs/reference/ecs-service.md

@@ -43,9 +43,9 @@ Note also that the `service` fields may be used directly at the root of the even
 
 | Location | Field Set | Description |
 | --- | --- | --- |
+| `service.entity.*` | [entity](/reference/ecs-entity.md) | Fields to describe various types of entities across IT environments. |
 | `service.origin.*` | [service](/reference/ecs-service.md) | _Reusing the `service` fields in this location is currently considered beta._ Describes the origin service in case of an incoming request or event. |
 | `service.target.*` | [service](/reference/ecs-service.md) | _Reusing the `service` fields in this location is currently considered beta._ Describes the target service in case of an outgoing request or event. |
-| `service.target.entity.*` | [entity](/reference/ecs-entity.md) | Entity information for the target service. |
 
 ### Service field usage [_service_field_usage]
 

docs/reference/ecs-user.md

@@ -50,10 +50,10 @@ Note also that the `user` fields may be used directly at the root of the events.
 | --- | --- | --- |
 | `user.changes.*` | [user](/reference/ecs-user.md) | Captures changes made to a user. |
 | `user.effective.*` | [user](/reference/ecs-user.md) | User whose privileges were assumed. |
+| `user.entity.*` | [entity](/reference/ecs-entity.md) | Fields to describe various types of entities across IT environments. |
 | `user.group.*` | [group](/reference/ecs-group.md) | User's group relevant to the event. |
 | `user.risk.*` | [risk](/reference/ecs-risk.md) | Fields for describing risk score and level. |
 | `user.target.*` | [user](/reference/ecs-user.md) | Targeted user of action taken. |
-| `user.target.entity.*` | [entity](/reference/ecs-entity.md) | Entity information for the targeted user. |
 
 ### User field usage [_user_field_usage]