title: Solr 6 Facet range query over streaming API
body: <p>While migrating from Solr legacy faceting to Solr streaming API, how to implement the below parameters:</p>
  
  <pre><code>&amp;facet = true
  &amp;facet.range = {!key=age_ranges}age
  &amp;f.age.facet.range.start = 0
  &amp;f.age.facet.range.end = 100
  &amp;f.age.facet.range.gap = 10
  &amp;facet.range = {!key=price_ranges}price
  &amp;f.price.facet.range.start = 0
  &amp;f.price.facet.range.end = 1000
  &amp;f.price.facet.range.gap = 50
  &amp;facet.field = a_field
  &amp;facet.minCount = 1
  </code></pre>
  
  <p>How can I implement these parameters using the new facet streaming with parallel functions. I understand rollup() functionality has to be used.But the documentation is limited and I am not able to understand the underlying functionality. Can someone help me with this?</p>