Revert "SOS-2476 Private Messaging portlet 'To' field autocomplete suggestion also searches by address data"

This reverts commit 53fdda18b7776a8d59418f8aade88113b8cceaa3.
Revert "LPS-47546 Private Messaging Portlet does not use the search index while searching users as part of autocomplete operation"

This reverts commit 190daa683f7d82d57216c043530129124a930398.