[Logstash]: Logstash Logs dashboard do not have the fields `logstash.log.integration` and `source`

### Integration Name

Logstash [packages/logstash]

### Dataset Name

_No response_

### Integration Version

2.11.1

### Agent Version

8.19.19

### Agent Output Type

elasticsearch

### Elasticsearch Version

8.19.19

### OS Version and Architecture

NA

### Software/API Version

_No response_

### Error Message

In Kibana (Dashboards Logs Logstash) Logstash Logs, the fields `logstash.log.integration` and `source` are empty

### Event Original

_No response_

### What did you do?

Integration has just been installed as is.

### What did you see?

### What did you expect to see?

populated fields or no fields.

### Anything else?

In packages/logstash/kibana/search/logstash-cfaba090-cbda-11e7-9852-73e0a9df1bb6.json

The fields `logstash.log.integration` and `source` do not exist in the Logstash indices they should be removed from this Kibana object and replaced by relevant ones.

Start with packages/logstash/kibana/search/logstash-cfaba090-cbda-11e7-9852-73e0a9df1bb6.json and inspect the fields used by the Logstash Logs dashboard. Compare them with fields present in the Logstash indices, then update the dashboard object so it no longer references the empty fields and uses relevant existing ones. Done means the dashboard displays populated fields or omits unavailable fields.

Written by the indexing model from the issue text.