LPS-39717 Index the content of ddm fields in a content field, like in JournalArticleIndexer
LPS-39717 Since we are indexing all the ddm fields in a content field, we don't need to search by each field of the ddmStructures
LPS-39717 Use the default locale of the site instead of the portal default locale
LPS-39717 Source formatting (use fetch instead of get and improve performance in the case of Basic document)
LPS-39717 Field.CONTENT is already in used to index the content of the file. Change it to ddmContent.