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i'm using sitecore 9.0.1, i'm trying to view custom interactions in the Experience Profile however when i open Experience profile i get no contacts (neither logged in nor anonymous contacts).

enter image description here After checking my cm logs i found the following exception:

Exception: Sitecore.XConnect.XdbSearchUnavailableException Message: An error occurred while sending the request. Source: Sitecore.XConnect.Client at Sitecore.XConnect.Client.WebApi.SearchWebApiClient.d__9`1.MoveNext() --- End of stack trace from previous location where exception was thrown ---

and the xconnect logs contains the following [ERROR]:

2018-11-27 14:20:22.589 +04:00 [Error] Sitecore.XConnect.Operations.XdbSearchOperation`1[Sitecore.XConnect.Contact]: System.TimeoutException: A wait for data to be indexed has been timed out. 2018-11-27 14:20:22.589 +04:00 [Error] ["XdbContextLoggingPlugin"] XdbContext Batch Execution Exception System.TimeoutException: A wait for data to be indexed has been timed out.

Any idea what might be causing this error??

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https://doc.sitecore.net/developers/xp/xconnect/xconnect-client-api/batch-indexing.html

xConnect increments a sync token in the storage layer each time a batch is submitted to xConnect. If the client’s SyncToken property is set when a search is performed, results will only be returned when indexing has caught up to at least that number.

The xConnect service ensures that data is indexed by the xConnect Indexer Service at least up to the SyncToken that is passed by the xConnect client. If the data is not yet indexed, the service waits for a certain period of time (30 seconds by default).

If after the 30 seconds the data is not yet in the search index, it throws System.TimeoutException: A wait for data to be indexed has been timed out. This is what you see in the logs.

Most likely the xConnect Indexer Service is stopped, slow or overloaded.

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@Roman Klimenko's answer did not work for me, but pointed me in the right direction.

My Indexer Service was running fine, sort of. The logs showed a lot of thrown excpeionts all over the place. It turns out my Solr service itself had entered a paused state so it was Solr rejecting all connections to it.

In my scenario, it was down because of a change in the Java path for the Environment Variable due to a recent Java update, but in general if Solr is down the search against the collection will throw a similar exception.

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