Spring confuses "mappingContext" when spring-data-elasticsearch is included

To reproduce, created a clean grails 3.1.x project (with `grails create-app myapp`) and then adding the dependency `compile 'org.springframework.data:spring-data-elasticsearch'`.

When I try to run (this is obviously just a subset of the full error, but you get the idea):
`Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'grailsLinkGenerator': Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type [org.springframework.data.elasticsearch.core.mapping.SimpleElasticsearchMappingContext] to required type [org.grails.datastore.mapping.model.MappingContext] for property 'mappingContext'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [org.springframework.data.elasticsearch.core.mapping.SimpleElasticsearchMappingContext] to required type [org.grails.datastore.mapping.model.MappingContext] for property 'mappingContext': no matching editors or conversion strategy found`

It has something to do with both using the bean "mappingContext" but I'm puzzled because as far as I can see, the `org.grails.web.mapping.DefaultLinkGenerator` has a `@Qualifier('grailsDomainClassMappingContext')` on the `mappingContext` and I know the spring-data-elasticsearch wouldn't get confused with a grails\* anything.

Reproduce the failure in a clean Grails 3.1.x app created with `grails create-app myapp` after adding `spring-data-elasticsearch`. Start by inspecting `org.grails.web.mapping.DefaultLinkGenerator`, its `mappingContext` property, and the reported bean-creation error. Done means the application starts without the conversion error between the Elasticsearch and Grails mapping contexts.

Written by the indexing model from the issue text.