PHRAS-4068 : expose fix field mapping bc break #949

Job	Run time
build phraseanet-nginx / build	2m 52s
build phraseanet-nginx / build	2m 52s
build phraseanet-db / build	32s
build phraseanet-db / build	32s
build phraseanet-fpm / build	4m 10s
build phraseanet-fpm / build	4m 10s
build phraseanet-setup / build	4m 12s
build phraseanet-setup / build	4m 12s
build phraseanet-elasticsearch / build	32s
build phraseanet-elasticsearch / build	32s
build phraseanet-worker / build	4m 23s
build phraseanet-worker / build	4m 23s
unit test	2m 20s
unit test	5m 43s
	41m 25s

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