This functions searches for objects either by executing
a key or/and full text query. The found objects can further
be filtered by an optional object query. They are sorted by
their importance. The second search operation is relatively
slow and its result can be limited to a certain number of
hits. This allows to perform an incremental search, each
returning just a subset of all found documents, starting at a
given index. The parameter array contains the 'keyquery'
or/and 'fulltextquery' depending on who you would like to
search. Optional parameters are 'objectquery', 'scope',
'lanugages' and 'attributeselector'. In case of an
incremental search the optional parameters 'startIndex',
numberOfObjectsToGet' and 'exactMatchUnit' can be passed.