Elastic Agent to Logstash to Elasticsearch

- Ingest models
- Elastic Agent to Elasticsearch using Logstash for advanced use cases such as enrichment, buffering, network bridging, multiple endpoints
- Elastic Agent to Logstash (for enrichment) to Elasticsearch
- Elastic Agent to Logstash to Elasticsearch: Logstash Persistent Queue (PQ) for buffering
- Elastic Agent to Logstash to Elasticsearch: Logstash as a proxy
- Elastic Agent to Logstash for routing to multiple Elasticsearch clusters and additional destinations