Logstash聚合插件索引错误求助（Elasticsearch 5.5.0环境）

Hey there, let's work through this aggregation error you're facing with Logstash 5.5.0. This issue almost always stems from conflicting or duplicate configuration in your aggregate plugin setup—let's break down how to diagnose and fix it.

Step 1: Locate Your Aggregate Plugin Config #

First, open up your logstash_etl.conf file (in /etc/logstash/conf.d/) and scan for the aggregate filter block(s). The error specifically calls out the task_id => "%{id}" pattern, so focus on any aggregate sections using that exact task ID.

Step 2: Identify Duplicate/Conflicting Filters #

The error means Logstash is seeing multiple aggregate filters targeting the same %{id} task ID—either in the same config file or across other configs in /etc/logstash/conf.d/. Here's what to check:

• Are there two separate aggregate blocks using task_id => "%{id}"? Logstash 5.5.0 doesn't handle multiple parallel aggregate blocks for the same task ID well. You'll need to merge their logic into a single block, or assign unique task IDs (like %{id}_order_tally and %{id}_customer_summary).
• Is there duplicate logic within a single aggregate block? For example, multiple add_field or code sections trying to modify the same field without proper coordination.

Step 3: Example Correct Aggregate Config (for 5.5.0) #

If you're aggregating data tied to the id field, your aggregate block should be a single, cohesive section. Here's a sample of a valid setup:

filter {
  aggregate {
    task_id => "%{id}"
    code => "
      # Initialize or increment a total orders counter
      map['total_orders'] ||= 0
      map['total_orders'] += event.get('order_count').to_i
    "
    map_action => "update"
    end_of_task => true
    timeout => 300 # Clean up old tasks after 5 minutes
  }
}

All logic related to the %{id} task should live here—no split blocks allowed in 5.5.0.

Step 4: Validate & Restart Logstash #

Before applying changes, test your config for syntax errors:

logstash -f /etc/logstash/conf.d/logstash_etl.conf --config.test_and_exit

If the test passes, restart Logstash to apply the fix:

# For systemd-based systems
sudo systemctl restart logstash

# For SysVinit systems
sudo service logstash restart

Step 5: Extra Troubleshooting Checks #

• Verify your JDBC query actually returns the id field! If id is missing from the select * from customers results, %{id} will resolve to the literal string "%{id}", causing all events to pile into the same task and trigger this error.
• Check other config files in /etc/logstash/conf.d/—Logstash loads all files here, so a duplicate aggregate block in another file could be the culprit.

内容的提问来源于stack exchange，提问作者PacificNW_Lover