Hyrax::Works do not index file sets

[elrayle]

Descriptive summary

Creating a Monograph, which is_a Hyrax::Work is_a Valkyrie::Resource, with files does not include member_ids_ssim in the solr_doc.

Rationale

Works should record their members in the solr doc.

Expected behavior

Creating a Monograph with files should include member_ids_ssim in the solr doc for the Monograph work.

Actual behavior

Creating a Monograph with files does not include member_ids_ssim in the solr doc for the Monograph work.

Steps to reproduce the behavior

Prerequisites

Edit .internal_test_app/config/initializers/hyrax.rb and set config

config.query_index_from_valkyrie = true
config.index_adapter = :solr_index

Test

1. Login
2. Dashboard -> Works -> Add new work -> select Monograph as the work type
3. Fill in required fields
4. Add a file
5. Save (forwards to the show page for the Monograph work)
6. Click Works in the breadcrumb to return to Dashboard -> Works

View the solr doc in the Valkyrie index core.

Related Issues

PR #4780 Add indexing for Hyrax::FileSet through valkyrie indexing

Issue #4795 - Hyrax::Works do not show Date Added in Dashboard -> Works
Issue #4788 - Hyrax::Works do not show thumbnail in Dashboard -> Works
Issue #4487 - Solr docs generated by ActiveFedora and Hyrax::ValkyrieWorkIndexer are not compatible