Resolution
Elasticsearch (ES) store documents into indices, so you need to create a index on ES, then you be able to send data through the REST API.
This command create a index named custom_builds in the es.example.com:9200 ES server.
curl -u USERNAME:PASSWORD -XPUT 'es.example.com:9200/custom_builds?pretty'
This command create a JSON file with some environment variables of the build, and send the data to the es.example.com:9200 ES server. You could put this script in a shell step in a FreeStyle job or in a sh step in a Pipeline job.
cat > message.json <<EOF
{
"enviroment": "$ENV",
"build_number": "$BUILD_NUMBER",
"build_tag": "$BUILD_TAG",
"job_base_name": "$JOB_BASE_NAME",
"job_name": "$JOB_NAME",
"node_name": "$NODE_NAME",
"node_labels": "$NODE_LABELS",
"status": "SUCCESS",
"date": "$(date +%Y%m%d-%H:%M:%S)"
}
EOF
curl -u USERNAME:PASSWORD -XPUT 'es.example.com:9200/custom_builds/external/1?pretty' -d '@message.json'