Update API token placeholders in Elastic Beats (#243)

Author: tothmano

send-data/elastic-beats.mdx

@@ -57,7 +57,7 @@ filebeat.inputs:
       - $PATH_TO_LOG_FILE
 output.elasticsearch:
   hosts: ['https://api.axiom.co:443/v1/datasets/DATASET_NAME/elastic']
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
 ```
 
@@ -92,7 +92,7 @@ metricbeat.modules:
 output.elasticsearch:
   hosts: ["https://api.axiom.co:443/v1/datasets/DATASET_NAME/elastic"]
   # Specify Axiom API token
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
 ```
 
@@ -118,7 +118,7 @@ metricbeat.modules:
   # Add other AWS configurations if needed
 output.elasticsearch:
   hosts: ["https://api.axiom.co:443/v1/datasets/DATASET_NAME/elastic"]
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
 ```
 
@@ -171,7 +171,7 @@ logging.level: info
 output.elasticsearch:
   hosts: ['https://api.axiom.co:443/v1/datasets/DATASET_NAME/elastic']
   # token should be an API token
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
 ```
 
@@ -224,7 +224,7 @@ output.elasticsearch:
   protocol: "https"
   ssl.verification_mode: "full"
   # token should be an API token
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
 ```
 
@@ -246,7 +246,7 @@ winlogbeat.event_logs:
 output.elasticsearch:
   hosts: ['https://api.axiom.co:443/v1/datasets/DATASET_NAME/elastic']
   # token should be an API token
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
   ssl.verification_mode: "certificate"
 
@@ -318,7 +318,7 @@ heartbeat.monitors:
 output.elasticsearch:
   hosts: ['https://api.axiom.co:443/v1/datasets/DATASET_NAME/elastic']
   # token should be an API token
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
 ```
 
@@ -363,7 +363,7 @@ auditbeat.modules:
 output.elasticsearch:
   hosts: ['https://api.axiom.co:443/v1/datasets/DATASET_NAME/elastic']
   # token should be an API token
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
 ```
 
@@ -451,7 +451,7 @@ protocols:
 output.elasticsearch:
   hosts: ['https://api.axiom.co:443/v1/datasets/DATASET_NAME/elastic']
   # api_key should be your API token
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
 ```
 
@@ -493,7 +493,7 @@ journalbeat.inputs:
 output.elasticsearch:
   hosts: ['https://api.axiom.co:443/v1/datasets/DATASET_NAME/elastic']
   # token should be an API token
-  api_key: 'axiom:$TOKEN'
+  api_key: 'API_TOKEN'
   allow_older_versions: true
 ```