Wildcard in Path for Match Query

I am looking to build a query filter in java for Elsaticsearch 5.2 to match any of the keywords wether they are author supplied or system generated. I am trying to do a wild card path but it does not return any results. I am using standard dynamic mapping in Elasticsearch.

    "content": {
        "title": "The History of Cats",
        "description": "A brief history of cats.",
        "keywords": {
            "author": ["cat"],
            "system": ["felis", "animalia"]

Ideally, if a user searches with the keyword cat or felis they should get a hit on this record. Currently, I do not receive any hits. Is this something that can be achieved through this query builder or another? Do I need to tweak mappings?

BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery();
queryBuilder.filter(QueryBuilders.matchQuery("content.keywords.*", keyword));

SearchRequestBuilder searchRequestBuilder = this.client.prepareSearch("my-index")

SearchResponse searchResponse = searchRequestBuilder.execute().actionGet();

return searchResponse;

Thanks Drew

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