Oh thank you, this makes sense! I spent hours to understand that part of the 
documentation :)
A couple of related questions:

1) Do I have to use text:entityField "uri" or can I replace "uri" with 
anything? Like "iri", "foo", "bar", ...

2) say I create an <#entMap> for each graph in the dataset, and use 
text:graphField "some-graph" in each <#entMap>. Can I define Lucene fields with 
the same name on different graphs? Or will fields with the same name be merged 
all together across all graphs?

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> Question 1) If I want to add more indexes, do I just add more of 
> "text:entityMap <#entMap>" to <#indexLucene>? Like "text:entityMap 
> <#entMap-1>", "text:entityMap <#entMap-2>", etc...

They are all held in the same Lucene file (index) but, yes, that indexes
different properties.

> Question 2) I don't understand what's going on in <#entMap>. What are 
> entityField, defaultField, and how does mapping work?!
>

jena-text uses a different Lucene field (string name) for each property
indexed.

The default is the Lucene default field - a Lucene concept - the lucene
query string can access multiple fields in one query. See the Lucene
documentation for details.

The entity field is the thing being indexed - the result - Lucene is a
inverted index.

Andy

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