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elasticdump --input=http://localhost:9201/collect-2017.04/collect --output=/Users/sbour/collect_id_2_04.json --searchBody '{"_source":["email"],"query":{"match":{"collect_id":2}}}' --sourceOnly --type=data

puis :

sed 's/{\"email\"\:\"//g' /Users/sbour/collect_id_2_04.json | sed 's/\"}//g' > collect_avril.jso