Loosen restriction on django-elasticsearch-dsl

[davidsmejia]

Issue Number

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Purpose/Implementation Notes

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Methods

If this pull request has any implications for data or metadata processing or addresses an issue labeled sci review, please include an overview of the methods used (e.g., briefly explain how the data gets processed).
See #267 for rationale.
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It may also be appropriate to include a description of any functional or unit tests in this section depending on their content.
Any pull request with a methods section requires scientific review in addition to code review.

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Functional tests

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Checklist

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• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

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