estunnel 
estunnel is a CLI tool written by rust for downloading data from elasticsearch.
Command-line options
```
USAGE:
estunnel pull [OPTIONS] --index --query
FLAGS:
--help Prints help information
-V, --version Prints version information
OPTIONS:
-b, --batch Scroll batch size. Size in query will be used if null.
-h, --host ElasticSearch host url [default: http://localhost:9200]
-i, --index Target index name(or alias)
-o, --output
This is the output of estunnel pull --help
.