#015087: ezcSearchSession should offer a method to retrieve and delete documents by their ids alone

ezcSearchSession should offer a method to retrieve and delete documents by their ids alone.

Retrieving documents by id is useful if you wish to update a particular field but do not know the current value of all other fields. Thus you cannot construct the full document to call update(). So you need to retrieve the current contents by id.

If you want to delete a bunch of documents of which you only have the ids there is no need to create a query, search for the documents and retrieve them in order to delete them afterwards. Thus there should be a method to delete all documents that have one of the supplied ids.

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