Thank you Ahmet for the suggestion. I checked the LukeRequestHandler.java code source and the it looks like this:
String s = reader.getIndexCommit().getUserData().get( SolrIndexWriter.COMMIT_TIME_MSEC_KEY); if (s != null) { indexInfo.add("lastModified", new Date(Long.parseLong(s))); } But this is the Solr code and not the Lucene code public class SolrIndexWriter extends IndexWriter { .... /** Stored into each Lucene commit to record the * System.currentTimeMillis() when commit was called. */ public static final String COMMIT_TIME_MSEC_KEY = "commitTimeMSec"; And I don't find this map key into Lucene code. Otherwise I can test the following code String s = indexReader.getIndexCommit().getUserData().get(" commitTimeMSec"); if (s != null) { lastModified = new Date(Long.parseLong(s)).toString(); } Thanks again Ahmet, Jean-Claude On Sat, Apr 8, 2017 at 10:31 PM, Ahmet Arslan <iori...@yahoo.com.invalid> wrote: > > Hi Jean, > How about LukeRequest handler? Many of the information displayed on the > admin screen comes from it.https://wiki.apache.org/solr/LukeRequestHandler > > Ahmet > On Sunday, April 9, 2017, 2:21:38 AM GMT+3, Jean-Claude Dauphin < > jc.daup...@gmail.com> wrote: > Hello, > > I need to check the index last modification date to count the number of > indexed terms only if tthe index has changed. > > Any idea or suggestion on how to do this. > > Thank you in advance. > > Best wishes, > > -- > Jean-Claude Dauphin >