Actually index related_dois

[jrhoads]

Purpose

Index related_dois in elasticsearch
Previous PRs created the mapping and logic for the indexing, but forgot to include it in the as_indexed_json method.

Types of changes

• Bug fix (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 change)

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• Be humble in the language and feedback you give, ask don't tell.
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• Offer suggestions on how to improve code e.g. simplification or expanding clarity.
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[jrhoads]

Current dependencies on/for this PR:

• master
  • PR Actually index related_dois #1055 👈

This stack of pull requests is managed by Graphite.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ **NoMethodError: private method select' called for nil:NilClass** app/models/doi/indexer/related_doi_indexer.rb i...` View Issue
• ‼️ **NoMethodError: undefined method downcase' for nil:NilClass** app/models/doi/indexer/related_doi_indexer.rb i...` View Issue
• ‼️ **NoMethodError: undefined method underscore' for nil:NilClass** app/models/doi/indexer/related_doi_indexer.rb i...` View Issue
• ‼️ **NoMethodError: undefined method downcase' for nil:NilClass** DataciteDoisController#update` View Issue

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