This gives 5 symbols with the highest rank in "All":

In[1]:= EntityValue["WolframLanguageSymbol", "Ranks", 
  "EntityAssociation"] // Query[TakeSmallest[5] /* Keys, "All"]

Out[1]= {Entity["WolframLanguageSymbol", "List"], 
 Entity["WolframLanguageSymbol", "Rule"], 
 Entity["WolframLanguageSymbol", "Times"], 
 Entity["WolframLanguageSymbol", "Power"], 
 Entity["WolframLanguageSymbol", "Plus"]}

This gives 5 symbols with the highest rank in "All":

In[1]:= EntityValue["WolframLanguageSymbol", "Ranks", 
  "EntityAssociation"] // Query[TakeSmallest[5] /* Keys, "All"]

Out[1]= {Entity["WolframLanguageSymbol", "List"], 
 Entity["WolframLanguageSymbol", "Rule"], 
 Entity["WolframLanguageSymbol", "Times"], 
 Entity["WolframLanguageSymbol", "Power"], 
 Entity["WolframLanguageSymbol", "Plus"]}

It is currently not possible to get the same result without retrieving all the data because a query like

EntityList[EntityClass[type, "property" -> value]]

is executed only when value is a simple expression like a number, quantity, entity, ..., or one of a selection of operators like ContainsAny[{entity1, ...}], GreaterThan[x], ... .