ElasticSeach JAVA API to find aliases given index

Recently I posted on stackoverflow on how to find aliases for the given index using JAVA API, so I thought I would like to it from here as well.

http://stackoverflow.com/questions/31170105/elasticseach-java-api-to-find-aliases-given-index

How to find aliases for given index in ElasticSearch using Java?
By using REST API it is pretty easy
https://www.elastic.co/guide/en/elasticsearch/reference/1.x/indices-aliases.html#alias-retrieving

While working with ElasticSearch, I ran into an issue where I needed to get a list of aliases based on provided index.

While getting a list of aliases is pretty straightforward:

 client.admin().cluster()
    .prepareState().execute()
    .actionGet().getState()
    .getMetaData().aliases();

While working with ElasticSearch, I ran into an issue where I needed to get a list of aliases based on provided index.
While getting a list of aliases is pretty straightforward:

 client.admin().cluster()
    .prepareState().execute()
    .actionGet().getState()
    .getMetaData().aliases();

I struggled to find an easy way to be able to get aliases for given index without having to iterate through everything first.
My first implementation looked something like this:

    ImmutableOpenMap<String, ImmutableOpenMap<String, AliasMetaData>> aliases = client.admin().cluster()
        .prepareState().execute()
        .actionGet().getState()
        .getMetaData().aliases();

    for (ObjectCursor<String> key: aliases.keys()) {
        ImmutableOpenMap<String, AliasMetaData> indexToAliasesMap = client.admin().cluster()
          .state(Requests.clusterStateRequest())
          .actionGet().getState()
          .getMetaData().aliases().get(key.value);

        if(indexToAliasesMap != null && !indexToAliasesMap.isEmpty()){
            String index= indexToAliasesMap.keys().iterator().next().value;
            String alias = indexToAliasesMap.values().iterator().next().value.alias();
        }
    }

I did not like it... and after poking around, I was able to get an idea on how to do it more efficiently by looking at RestGetIndicesAliasesAction (package org.elasticsearch.rest.action.admin.indices.alias.get)
This is what I end up with:

    ClusterStateRequest clusterStateRequest = Requests.clusterStateRequest()
            .routingTable(false)
            .nodes(false)
            .indices("your_index_name_goes_here");

    ObjectLookupContainer<String> setAliases= client
            .admin().cluster().state(clusterStateRequest)
            .actionGet().getState().getMetaData()
            .aliases().keys();

You will be able to find aliases for the index that you specified in setAliases
Hope it helps someone!