Hello friends, 
I build a search component which is working fine on an object named "Mediathek". I find results when I search through the component but the problem is, that by clicking on the results, I'm not lead to the record. Could you tell me what the reason in my code could be?

COMPONENT:

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId" access="global" controller="MediathekSearchController">
 
    <!-- handlers-->
    <aura:handler name="init" value="{!this}" action="{!c.init}"/>
 
    <!-- attributes -->
    <aura:attribute name="showSearchResults" type="Boolean" default="false"/>
    <aura:attribute name="searchKey" type="String"/>
    <aura:attribute name="mediathekList" type="List" default="Mediathek[]"/>
    <aura:attribute name="mediathekColumns" type="List"/>
    
 
    <lightning:layout multipleRows="true">
        <lightning:layoutItem padding="around-small" size="9">
            <lightning:input name="searchKey" placeholder="Enter search key" value="{!v.searchKey}"/>
        </lightning:layoutItem>
        <lightning:layoutItem padding="around-small" size="3">
            <lightning:button variant="brand" label="Search" title="Search" onclick="{!c.search}" class="customButton"/>
        </lightning:layoutItem>
    </lightning:layout>
 
    <aura:if isTrue="{!v.showSearchResults}">
        <lightning:layout multipleRows="true">
            <lightning:layoutItem padding="around-small" size="12">
                Mediathek
                <lightning:datatable keyField="id"
                                     data="{!v.mediathekList}"
                                     columns="{!v.mediathekColumns}"
                                     hideCheckboxColumn="true"/>
            </lightning:layoutItem>
            
        </lightning:layout>
    </aura:if>
 
</aura:component>

CONTROLLER

({
    init: function (component, event, helper){
       component.set('v.mediathekColumns', [
            {label: 'Mediathek Name', fieldName: 'Name', type: 'url', 
            typeAttributes: {label: { fieldName: 'Name' }, target: '_blank'}},
            
        ]);
        
    },
 
    search : function(component, event, helper) {
        helper.getSearchResultsFromApex(component, event, helper);
        component.set("v.showSearchResults",true);
    }
})

HELPER

({
    getSearchResultsFromApex : function(component, event, helper){
     
        var action = component.get("c.getSearchResult");
        action.setParams({ searchKey : component.get("v.searchKey") });
     
        // Create a callback that is executed after
        // the server-side action returns
        action.setCallback(this, function(response) {
            var state = response.getState();
            if (state === "SUCCESS") {
 var result = response.getReturnValue();
  result.forEach(function(result){
                    result.Name = '/'+result.Id;
                      
                });
               
                // SOSL will always return the list in the order they were queried
                component.set("v.mediathekList",result[0]);
                  
                
            }
            else if (state === "INCOMPLETE") {
                // do something
            }
                else if (state === "ERROR") {
                    var errors = response.getError();
                    if (errors) {
                        if (errors[0] && errors[0].message) {
                            console.log("Error message: " +
                                        errors[0].message);
                        }
                    } else {
                        console.log("Unknown error");
                    }
                }
        });
        $A.enqueueAction(action);
    }
})

STYLE

.THIS .customButton{
    margin-top: 19px;
}

.cMediathekSuchleiste{
 height: 50px;
  background-color:#ffffff;
}


APEX CLASS

public class MediathekSearchController {

 
    @AuraEnabled(cacheable=true)
    public static List<List<sObject>> getSearchResult(String searchKey){
     
        List<List<sObject>> searchResult = [FIND :searchKey
                                            IN ALL FIELDS RETURNING
                                            Mediathek__c (Id, Name)
                                            ];
        return searchResult;
     
    }
}