Styjun

I basically want to retrieve all types of a given elasticsearch index using the java client. I'm working with elasticsearch 5.4.1.

I already succeeded to get the list of indices with this code :

indices = client.admin()
 .indices()
 .getIndex(new GetIndexRequest())
 .actionGet()
 .getIndices();

So now, let's say I want all types of the first index, how can I manage to do so ?

This is what I already tried but it's not working. I can't resolve the ObjectObjectCursor dependency (com.carrotsearch.hppc.cursors.ObjectObjectCursor).

try 
 GetMappingsResponse res = clientTest.admin().indices().getMappings(new GetMappingsRequest().indices(myIndex)).get();
 ImmutableOpenMap<String, MappingMetaData> mapping = res.mappings().get(myIndex);
 for (ObjectObjectCursor<String, MappingMetaData> c : mapping) 
 typeList.add(c);
 
 catch (InterruptedException e) 
 e.printStackTrace();
 catch (ExecutionException e) 
 e.printStackTrace();

Not sure why you are using ObjectObjectCursor class but you can do it with simple iterator, e.g.:

GetMappingsResponse res = client.admin().indices().getMappings(new GetMappingsRequest().indices("<index_name>")).get();
ImmutableOpenMap<String,ImmutableOpenMap<String,MappingMetaData>> mappings = res.getMappings();
System.out.println(mappings);
ImmutableOpenMap<String,MappingMetaData> mapping = mappings.get("<type_name>");
for(Iterator<MappingMetaData> iterator = mapping.valuesIt() ; iterator.hasNext();) 
 MappingMetaData metaData = iterator.next();
 System.out.println(metaData.getSourceAsMap());

Although this just prints the mappings, you can use it to access different components and their types.