Lib.rs

🏎️ esq – the minimalist CLI to query Elasticsearch.

esq is an opinionated, minimalist and blazing-fast command-line tool to query and manipulate logs in Elasticsearch. It's designed to be a small, composable tool that works well with others.

⚡ Requirements

• Elasticsearch 7.10 or higher

🎯 Philosophy

🐧 Linux-style simplicity – esq does one thing well: fetching logs fast.

🛠 Composability – Use it with your favorite command line tools.

💡 You won't find fancy built-in JSON parsing or log transformations here. Use the json swiss army knife aka JQ to process output.

🚀 Installation

From Source

cargo install --git https://github.com/jiel/esq

Binary Releases

Download the latest release for your platform from the releases page.

📝 Usage

# Login to your instance
esq login

# list available indexes
esq ls

# Basic usage - fetch recent logs from an index
esq cat my-logs-index

# Fetch logs around a specific time
esq cat my-logs-index --around "2:00pm"

# Fetch logs from a specific time range
esq cat my-logs-index --from "10:00:00" --to "10:00:30"

# Follow logs in real-time (like tail -f)
esq cat my-logs-index --follow

# Select specific fields only
esq cat my-logs-index --select "timestamp,message,level"

# Fetch logs with specific conditions
esq cat my-logs-index --where "level:ERROR"

# Get more logs
esq cat my-logs-index -n 10000

🛠 Composability Examples

Formating logs with jq

esq cat my-logs-index  --select @timestamp,level,message --where level:ERROR | jq ".message"

Filter logs with jq

esq cat my-logs-index --where level:ERROR | jq 'select(.message | test("critical"))'

Count logs by level

esq cat my-logs-index --select level |  sort | uniq -c

Extract structured data and convert to CSV

esq cat my-logs-index --select timestamp,level,message | jq -r '[.timestamp, .level, .message] | @csv' > logs.csv

📊 Performance Tips

• Use the --select option to fetch only the fields you need
• Use the --where option to filter logs at the source, reducing data transfer
• Process logs in batches (reasonable -n values) for better performance
• For time-based queries, use narrower time ranges when possible

👨‍💻 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgements

• The Rust developers 🦀 for creating a robust and efficient ecosystem
• clap for powerful command-line argument parsing
• dateparser for flexible date parsing
• Elasticsearch for their powerful search capabilities

Built with ❤️ by JLT