Solr doesn't import the whole data

[LOPEZ-CORTES Mariano-ext]

Hi

We've finished the data import of 40 millions data into a 3 node Solr cluster.

After injecting all data via a Java program, we've noticed that the number of 
documents was less than expected (in 100000 rows).
No exception, no error.

Some config details:

                               <autoCommit>
                                               <maxTime>15000</maxTime>
                                               
<openSearcher>false</openSearcher>
                               </autoCommit>
                                <autoSoftCommit>
                                               <maxTime>15000</maxTime>
                               </autoSoftCommit>

We have no commits in the client application.

But also, when consulting via admin, we've noticed that the number total of 
rows in Solr increase slowly (numFound).

It's a normal behaviour? What's the problem?

Thanks!