Extracting ppt gives .emf and .excel.
.excel file has not data in it. But viewing the ppt we are able see that chart data.
Below is earlier discussion form https://lucene.472066.n3.nabble.com/jira-Created-TIKA-1033-Tika-doesn-t-parse-embedded-OLE-Chart-Graph-objects-td4022591.html
I see that the issue is raised earlier. https://bz.apache.org/bugzilla/show_bug.cgi?id=54213#c3
Any help would be appreciated.