How to ingest data into Elasticsearch using Logstash?

Here are the high-level steps to ingest data into Elasticsearch using Logstash:

1. Install Logstash: Download and install Logstash on the machine that will be used to ingest data.

2. Create a Logstash configuration file: Create a configuration file that specifies the input source, output destination, and any filters that should be applied to the data. The configuration file is written in the Logstash configuration language and should be saved with a .conf file extension.

3. Start Logstash: Start Logstash using the command line or service manager. Logstash will read the configuration file and begin ingesting data.

4. Verify data ingestion: Monitor Logstash to ensure that data is being ingested correctly. You can use the Logstash monitoring API or the Logstash web UI to view ingestion statistics and troubleshoot any issues.

Here is an example Logstash configuration file that ingests data from a CSV file and indexes it into Elasticsearch:

input {
  file {
    path => "/path/to/csv/file.csv"
    start_position => "beginning"
    sincedb_path => "/dev/null"
  }
}

filter {
  csv {
    separator => ","
    columns => ["column1", "column2", "column3"]
  }
}

output {
  elasticsearch {
    hosts => ["localhost:9200"]
    index => "my-index"
  }
}

This configuration file reads data from a CSV file, applies a CSV filter to parse the data, and indexes the data into Elasticsearch using the elasticsearch output plugin.

Overall, Logstash provides a flexible and powerful way to ingest data into Elasticsearch, and can be customized to handle a wide range of input sources and data types.