getCompletions retrieves potential completions for a partially typed
query. It can be used by a custom client to implement autocomplete as the user
is typing.
Parameters:
profile - Required. Specifies which profile you're working with.
term - Required. The partially typed term to get completions for.
Output:
Zero or more Completion elements are returned. Their text content is a
potential completion, and each completion has attributes:
profile - the profile this completion came from.
score - the score for this completion. Completions are ranked
according to score, which can be derived from occurrences in the content,
queries, and search user clicks.
