Proper support for the scaled_float type (along with it scaling_factor) was added to the ECS tooling recently and will be included in the upcoming ECS 1.8.0 release.
I suspect you're using git checkout v1.7.0 to switch the target version to generate these 1.7.0 mappings? As a workaround, you can work from the master branch (which includes the support for scaled_float/scaling_factor in the generator) and use the --ref flag to target the 1.7.0 fields:
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