sample_twitter_data.sh

#!/usr/bin/env bash
set -e -x

tweets=$(cat <<-END
{ "username" : "eriky", "post_date" : "2019-12-08T14:10:12", "message" : "I wrote an article on Elasticsearch" }
{ "username" : "elon", "post_date" : "2019-12-08T14:16:12", "message" : "Anyone needs a flight to Mars? I have seats available." }
{ "username" : "eriky", "post_date" : "2019-12-08T15:10:12", "message" : "@elon Count me in! I love Mars (and Elasticsearch)" }
{ "username" : "kimchy", "post_date" : "2019-12-08T15:30:22", "message" : "@eriky I it too (Elasticsearch, not Mars)" }
END
)

IFS=$'\n'

for tweet in $tweets; do
  curl -X POST "localhost:9200/twitter/_doc/?pretty" -H 'Content-Type: application/json' -d "$tweet"
done