[Prometheus] Enable tsdb by default for collector and query datastreams (#7261)

* enable tsdb by default

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

* fix pr url

* Update packages/prometheus/changelog.yml

Co-authored-by: Andrew Gizas <andreas.gkizas@elastic.co>

---------

Signed-off-by: Tetiana Kravchenko <tetiana.kravchenko@elastic.co>
Co-authored-by: Andrew Gizas <andreas.gkizas@elastic.co>

Author: tetianakravchenko

packages/prometheus/changelog.yml

@@ -1,4 +1,9 @@
 # newer versions go on top
+- version: "1.8.0"
+  changes:
+    - description: Enable TSDB by default for collector and query metrics data streams. This improves storage usage and query performance. For more details, see https://www.elastic.co/guide/en/elasticsearch/reference/current/tsds.html. Still TSDB is not supported for remote_write 
+      type: enhancement
+      link: https://github.com/elastic/integrations/pull/7261
 - version: "1.7.0"
   changes:
     - description: Revert metrics field definition to the format used before introducing metric_type

packages/prometheus/data_stream/collector/manifest.yml

@@ -1,5 +1,7 @@
 title: Prometheus collector metrics
 type: metrics
+elasticsearch:
+  index_mode: "time_series"
 streams:
   - input: prometheus/metrics
     vars:

packages/prometheus/data_stream/query/manifest.yml

@@ -1,5 +1,7 @@
 title: Prometheus query metrics
 type: metrics
+elasticsearch:
+  index_mode: "time_series"
 streams:
   - input: prometheus/metrics
     vars:

packages/prometheus/manifest.yml

@@ -1,7 +1,7 @@
 format_version: 1.0.0
 name: prometheus
 title: Prometheus
-version: 1.7.0
+version: 1.8.0
 license: basic
 description: Collect metrics from Prometheus servers with Elastic Agent.
 type: integration