Remove hard-coded dataset value (#15653)

Otherwise, it overrides the configured value.
Add a test for the change.

Author: rdner

packages/filestream/_dev/test/system/test-filestream-custom-dataset-config.yml

@@ -0,0 +1,8 @@
+service: filestream-logfile
+input: filestream
+vars:
+  data_stream.dataset: elastic_agent.test
+  paths:
+    - "{{SERVICE_LOGS_DIR}}/test-filestream.log"
+assert:
+  hit_count: 201

packages/filestream/changelog.yml

@@ -1,4 +1,9 @@
 # newer versions go on top
+- version: "2.0.1"
+  changes:
+    - description: Remove hard-coded dataset field
+      type: bugfix
+      link: https://github.com/elastic/integrations/pull/15653
 - version: "2.0.0"
   changes:
     - description: Migrate to input package type

packages/filestream/fields/base-fields.yml

@@ -14,7 +14,6 @@
 - name: event.dataset
   type: constant_keyword
   description: Event dataset
-  value: filestream.generic
 - name: "@timestamp"
   type: date
   description: Event timestamp.

packages/filestream/manifest.yml

@@ -3,7 +3,7 @@ name: filestream
 title: Custom Logs (Filestream)
 description: Collect log data using filestream with Elastic Agent.
 type: input
-version: 2.0.0
+version: 2.0.1
 conditions:
   kibana:
     version: "^9.2.0"