Add disclaimet to docs

docs/MongodbEventRepository.md

@@ -27,6 +27,8 @@ By default, the class already has some base methods:
 - `withSession (session: ClientSession)`: Begins a MongoDB session to initiate a transaction (only on Mongo 4.0) and returns an object with the available methods which can be executed within a session. If this following command throws an error, the whole session suffers a rollback, otherwise it is commited.
 - `_runPaginatedQuery (query: { [key: string]: any }, page: number, size: number, sort: { [key: string]: 1|-1 } = {})`: Executes a query aplying pagination to the result. Returns an object that follows the [IPaginatedQueryResult](#ipaginatedqueryresult) interface.
 
+> **Note:** `_runPaginatedQuery` should only be used **inside** the child class because it'll return a collection of **documents** and not a collection of **entities**. This harms the principle for entity-first design this repository is all about. In order to create a useful method, please refer to the example below on how to create a `search` method using `_runPaginatedQuery` properly
+
 ## Sessions
 
 If your MongoDB version is 4.0 or higher (with transaction support), in order to execute a command using a transaction, follow this example: