public String getFilterKey() {
        return this.filterKey;
    }
<p>
The key to use for filtering data. For example, <code>QUEUE</code>, <code>ROUTING_PROFILE, AGENT</code>,
<code>CHANNEL</code>, <code>AGENT_HIERARCHY_LEVEL_ONE</code>, <code>AGENT_HIERARCHY_LEVEL_TWO</code>,
<code>AGENT_HIERARCHY_LEVEL_THREE</code>, <code>AGENT_HIERARCHY_LEVEL_FOUR</code>,
<code>AGENT_HIERARCHY_LEVEL_FIVE</code>. There must be at least 1 key and a maximum 5 keys.
</p>

@return The key to use for filtering data. For example, <code>QUEUE</code>, <code>ROUTING_PROFILE, AGENT</code>,
        <code>CHANNEL</code>, <code>AGENT_HIERARCHY_LEVEL_ONE</code>, <code>AGENT_HIERARCHY_LEVEL_TWO</code>,
        <code>AGENT_HIERARCHY_LEVEL_THREE</code>, <code>AGENT_HIERARCHY_LEVEL_FOUR</code>,
        <code>AGENT_HIERARCHY_LEVEL_FIVE</code>. There must be at least 1 key and a maximum 5 keys.
aws-java-sdk-connect/src/main/java/com/amazonaws/services/connect/model/FilterV2.java