I solved it by editing the "datastore-indexes-auto" in WAR-> WEB-INF.

it was:

 <datastore-index kind="Stock" ancestor="false" source="auto">
        <property name="user" direction="asc"/>
        <property name="createDate" direction="asc"/>
    </datastore-index>

changed to:

 <datastore-index kind="Stock" ancestor="false" source="manual">
        <property name="user" direction="asc"/>
        <property name="createDate" direction="asc"/>
    </datastore-index>

I re-uploaded the code to app engine, waited for the index to be created and it 
worked


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