[7.x] [Mappings editor] Fix cannot set boolean value for "null_value" param (#55015)#55150

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sebelga merged 1 commit intoelastic:7.xfrom sebelga:backport/7.x/pr-55015

Jan 17, 2020

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Commits on Jan 17, 2020

[Mappings editor] Fix cannot set boolean value for "null_value" param (elastic#55015 )
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