That is a documented feature here: http://actionml.com/docs/ur_queries 
<http://actionml.com/docs/ur_queries> Contextual Personalized With Similar 
Items. No longer experimental, it’s best used when you boost either user or 
personal above the other or use it to give item based when there is no user 
information.

The problem below can probably be solved by changing indexName in engine.json. 
You look to have gotten into a weird state.


On Oct 10, 2016, at 6:24 PM, Gustavo Frederico 
<[email protected]> wrote:


  How can I query for recommendations for a given item and a given user? For 
instance, considering the context of a product details page viewed by the 
current shopper. I tried to simply set the Json to {"user":"...","item":"..."} 
but I got the error below.  ( out-of-the-box installation with no model 
customization )  I'm not sure if the scenario is not supported, or if there's a 
problem with the query data.

Gustavo


2016-10-09 15:26:09,468 INFO  com.thinkwrap.parsley.ur1.URAlgorithm 
[ForkJoinPool-2-worker-1] - Query received, user id: 
Some(57D1B24662712CC7696219FA9304D22F), item id: Some(1934793)
2016-10-09 15:26:09,662 ERROR io.prediction.workflow.ServerActor 
[pio-server-akka.actor.default-dispatcher-375] - Query:
{"user":"57D1B24662712CC7696219FA9304D22F","item":"1934793"}

Stack Trace:
org.elasticsearch.ElasticsearchIllegalArgumentException: Alias [urindex] has 
more than one indices associated with it [[urindex_1474506677785, 
urindex_1473114260084]], can't execute a single index op
        at 
org.elasticsearch.cluster.metadata.MetaData.concreteIndices(MetaData.java:792)
        at 
org.elasticsearch.cluster.metadata.MetaData.concreteIndices(MetaData.java:707)
        at 
org.elasticsearch.cluster.metadata.MetaData.concreteSingleIndex(MetaData.java:763)
        at 
org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction$AsyncSingleAction.<init>(TransportShardSingleOperationAction.java:139)
        at 
org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction$AsyncSingleAction.<init>(TransportShardSingleOperationAction.java:116)
        at 
org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction.doExecute(TransportShardSingleOperationAction.java:89)


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