My Exstream support is too busy with other issues, so meanwhile I did get a solution working with IBM.
The Exstream team gave me a test PDF many months ago, that I was unable to use for some time, mainly since I thought I needed something else to go with it.
To not lose too much time, I also posed the problem to IBM. IBM finally told me I could nevertheless make the indexer type = PDF, and identify upper-left and lower-right coordinates for each field.
It took some work, but I was able to get the values, which turned out to be at the hundredths of an inch decimal value, and load and index the PDF sample file. I can't give more details, since I did this almost a month ago. I just needed rectangular coordinates that were VERY tight to the print fields on a normal size page. I'm sure I worked at the trigggers first, or one of them, and when ARSLOAD indicated I had a good value, I worked each successive field very closely, too, until they were all done.
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COORDINATES=IN
INDEXSTARTBY=1
TRIGGER1=ul(7.63,0.24),lr(8.03,0.45),*,'Page 1'
TRIGGER2=ul(6.40,8.95),lr(6.86,9.13),0,'AMOUNT'
FIELD1=ul(4.51,0.67),lr(6.28,0.88),0,(TRIGGER=1,BASE=0)
FIELD2=ul(1.02,9.36),lr(3.50,9.57),0,(TRIGGER=1,BASE=0)
FIELD3=ul(1.02,9.51),lr(3.50,9.72),0,(TRIGGER=1,BASE=0)
FIELD4=ul(0.66,1.35),lr(1.34,1.55),0,(TRIGGER=1,BASE=0)
FIELD5=ul(7.10,8.93),lr(8.15,9.14),0,(TRIGGER=2,BASE=0)
INDEX1='ACCOUNT NUMBER',FIELD1,(TYPE=GROUP)/* ACCOUNT NUMBER */
INDEX2='NAME',FIELD2,(TYPE=GROUP)/* NAME */
INDEX3='ADDRESS',FIELD3,(TYPE=GROUP)/* ADDRESS */
INDEX4='CAN NO',FIELD4,(TYPE=GROUP)/* CAN NO */
INDEX5='AMOUNT DUE',FIELD5,(TYPE=GROUP)/* AMOUNT DUE */
