Written in conjunction with Post Build Index Writer Module, the IndexReader will translate the fields in the index and re-insert the information into a BuildResultSummary object, which has a specially designated customBuildData map for this purpose.

  <indexReader key="cloverIndexReader" name="Reads Clover result values from index"
          class="com.atlassian.bamboo.builder.coverage.CloverIndexReader">
    <description>Reads the clover result from an index document and populates into build result summary</description>
  </indexReader>