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.