Field reference must be used instead of field name when indexing ddmFieldName

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.4.0 CE GA1, 7.4.2 CE GA3, 7.4.13 DXP GA1, Master
• Component/s: Data Engine, Forms
• Labels:
  • migration_to_dataengine
• Fix Priority: 4
• Sprint: Data_Engine_7.4_10
• Git Pull Request: https://github.com/liferay-data-engine/liferay-portal/pull/376

Introduction:
Since field names are now hidden from the UI, users should use field references whenever they can to search for documents in the search engine.

Steps to reproduce:

1. Go to Content & Data > Web Content and click on the Structures tab;
2. Click to add a new structure;
3. Add a text field and, in its advanced settings, change the field reference to any name you prefer;
4. Save the structure;
5. Go back to the Web Content tab and click to create a new content based on the structure just created;
6. Fill the title, content and publish it;
7. Search your search engine index for documents with entryClassName equals to "com.liferay.journal.model.JournalArticle" (if you're using Elasticsearch, you can use elasticsearch-head for an easy visualization of the index).

Actual result:
Documents having the following field where its ddmFieldName is composed by field's name (no more available in the UI):

"ddmFieldArray": [
    {
        "ddmFieldName": "ddm__keyword__31917__Text54132543_en_US",
        "ddmFieldValueKeyword_en_US": "test text",
        "ddmFieldValueKeyword_en_US_String_sortable": "test text",
        "ddmValueFieldName": "ddmFieldValueKeyword_en_US"
    }
],

Expected result:
Documents having the following field where its ddmFieldName is composed by field's reference (available in the UI since 7.3 FP1):

"ddmFieldArray": [
    {
        "ddmFieldName": "ddm__keyword__31917__MyCustomText_en_US",
        "ddmFieldValueKeyword_en_US": "test text",
        "ddmFieldValueKeyword_en_US_String_sortable": "test text",
        "ddmValueFieldName": "ddmFieldValueKeyword_en_US"
    }
],