Return parents with or without children

[benjes (Immo Benjes)]

Hi,

I've got a parent child model (see Reindexing Elasticsearch index with parent and child relationship) and I want to run a query that returns a list of all (or filtered) documents. In that list I want to have inner_hits when the document has children but it should also include documents that do not have children!

I currently have:

{
      "query": {
      	"bool": {
      		"must":[ {
      			"match_all": {}	
      		},{
    		    "has_child": {
    		      "type": "child_message",
    		      "query": {
    		        "match_all": {}
    		      },
    		      "inner_hits": {}    
    		    }
    	    }]
      	}
      }
    }

But this only returns documents that do have children, not documents that don't have children. What do I need to do to get all document that match the original search whether they have children or not but if they have children they should be included in inner_hits