I am new to Solr and we are using Spring-data for Solr

I have a question may be its too simple but I am unable to comprehend.

Basically I need to search on any field but I have a "zip" field as one of the facet fields.

I have a Solr repository . (Am not sure if the annotations on the Repository are correct.)

public interface MyRepository extends SolrCrudRepository<MyPOJO, String> {

    @Query(value = "*:*")
    @Facet(fields={"zip"})
    public FacetPage<MyPOJO> findByQueryandAnno(String searchTerm,Pageable page);

} 

In my Service class I am trying to call this methods by Injecting MyRepository like below

public class MyService {

  @Inject
  MyRepository solrRepo;

  @Inject
  SolrTemplate solrTemplate;

  public FacetPage<MyPOJO> tryFacets(String searchString){

    //Here is where I am struggling
    SimpleFacetQuery query = 
      new SimpleQuery(new SimpleStringCriteria(searchString));
    query.setFacetOptions(new FacetOptions("zip"));

    //Not sure how to get the Pageable object. 
    //But the repository doesnt accept without it.
    return solrTemplate.queryForPage(query,{Pageable Instance to be passed here})

}

From my jUnit I am loading context files needed for Solr and Spring

//In jUnit the test method looks like this
service.tryFacets("some value");

and it fails with - method not found in the service class at the call to the repository method.

*********EDIT****************

As per ChristophStrobl's advice created a copyfield called multivaluedCopyField and the searchString argument works good. But the facet still isnt working...Now my code looks like this. I get the MyPOJO object as response but the facetcount and the faceted values are missing.

    public interface MyRepository extends SolrCrudRepository<MyPOJO, String> {

    @Query(value = "*:*")
    @Facet(fields={"zip"})
    public FacetPage<MyPOJO> findByQueryandAnno(String searchTerm,Pageable page);

} 

My service class looks like

public class MyService {

  @Inject
  MyRepository solrRepo;


  public FacetPage<MyPOJO> tryFacets(String searchString){

    //Here is where I am struggling
    SimpleFacetQuery query = 
      new SimpleQuery(new SimpleStringCriteria(searchString)).setPageRequest new       
      PageRequest(0,5));

       query.setFacetOptions(new FacetOptions("zip"));

       FacetPage<MyPOJO> facetedPOJO=  
       solrRepo.findByQueryandAnno(searchString,query.getPageRequest());

       return facetedPOJO;

}

My jUnit method call is like

service.tryFacets("some value");