[Nginx] Add benchmark template for error logs

packages/nginx/_dev/benchmark/rally/error-benchmark.yml

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+---
+description: Benchmark 20000 nginx error logs
+data_stream:
+  name: error
+corpora:
+  generator:
+    total_events: 20000
+    template:
+      type: gotext
+      path: ./error-benchmark/template.ndjson
+    config:
+      path: ./error-benchmark/config.yml
+    fields:
+      path: ./error-benchmark/fields.yml

packages/nginx/_dev/benchmark/rally/error-benchmark/config.yml

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+fields:
+  - name: 'timestamp'
+    period: -24h # one day
+  - name: agent.id
+    value: "da6cb4c8-c84c-4c5f-97c7-f8586a098af4"
+  - name: cloud.region
+    enum: ["us-east-1", "us-east-2", "us-west-1", "us-west-2", "ap-south-1", "ap-northeast-3", "ap-northeast-2", "ap-southeast-1", "ap-southeast-2", "ap-northeast-1", "ca-central-1", "eu-central-1", "eu-west-1", "eu-west-2", "eu-west-3", "eu-north-1", "sa-east-1", "af-south-1", "ap-east-1", "ap-south-2", "ap-southeast-3", "eu-south-2", "eu-central-2", "me-south-1", "me-central-1"]
+    cardinality: 100
+  - name: host.name
+    cardinality: 100
+  - name: client.ip
+    cardinality: 100
+  - name: process.pid
+    cardinality: 65000
+  - name: process.thread.id
+    cardinality: 4

packages/nginx/_dev/benchmark/rally/error-benchmark/fields.yml

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+- name: timestamp
+  type: date
+- name: client.ip
+  type: ip
+- name: message
+  type: text
+- name: host.name
+  type: keyword
+- name: agent.id
+  type: keyword
+- name: cloud.region
+  type: keyword
+- name: process.pid
+  type: long
+- name: process.thread.id
+  type: long

packages/nginx/_dev/benchmark/rally/error-benchmark/template.ndjson

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+{{- $timestamp := generate "timestamp" }}
+{{- $ip := generate "client.ip" }}
+{{- $hostname := generate "host.name" }}
+{{- $agentId := generate "agent.id" }}
+{{- $processPid := generate "process.pid" }}
+{{- $processThreadId := generate "process.thread.id" }}
+{
+  "@timestamp": "{{ $timestamp.Format "2006-01-02T15:04:05.999999Z07:00" }}",
+  "log.file.path": "/var/log/nginx/error.log",
+  "data_stream": {
+    "namespace": "ep",
+    "type": "logs",
+    "dataset": "nginx.error"
+  },
+  "message": "{{$timestamp | date "2006/01/02 15:04:05"}} [error] {{$processPid}}#{{$processThreadId}}: *1 open() \"/usr/local/Cellar/nginx/1.10.2_1/html/favicon.ico\" failed (2: No such file or directory), client: {{$ip}}, server: localhost, request: \"GET /favicon.ico HTTP/1.1\", host: \"localhost:8080\", referrer: \"http://localhost:8080/\"",
+  "event": {
+    "dataset": "nginx.error",
+    "timezone": "CET"
+  },
+  "host": {
+    "name": "{{$hostname}}"
+  },
+  "agent": {
+    "id": "{{$agentId}}",
+    "name": "{{$hostname}}",
+    "type": "filebeat",
+    "version": "8.8.0",
+    "ephemeral_id": "{{$agentId}}"
+  },
+  "tags": [
+    "preserve_original_event"
+  ]
+}