Yes, I'm not looking to change the source value. The extra tokens I'm seeing are from looking at the results of _analyze using the specified filter:
curl "http://localhost:9200/customers/_analyze?analyzer=large_text_blobs&index=customers&text=1%2C+2%2C+3%2C+4%2C+5%2C+6%2C+7%2C+8%2C+9%2C+10%2C+11%2C+12%2C+13%2C+14%2C+15%2C+16%2C+17%2C+18%2C+19%2C+20%2C+21%2C+22%2C+23%2C+24%2C+25%2C+26%2C+27%2C+28%2C+29%2C+30%2C+31%2C+32%2C+33%2C+34%2C+35%2C+36%2C+37%2C+38%2C+39%2C+40%2C+41%2C+42%2C+43%2C+44%2C+45%2C+46%2C+47%2C+48%2C+49%2C+50%2C+51%2C+52%2C+53%2C+54%2C+55%2C+56%2C+57%2C+58%2C+59%2C+60%2C+61%2C+62%2C+63%2C+64%2C+65%2C+66%2C+67%2C+68%2C+69%2C+70%2C+71%2C+72%2C+73%2C+74%2C+75%2C+76%2C+77%2C+78%2C+79%2C+80%2C+81%2C+82%2C+83%2C+84%2C+85%2C+86%2C+87%2C+88%2C+89%2C+90%2C+91%2C+92%2C+93%2C+94%2C+95%2C+96%2C+97%2C+98%2C+99%2C+100%2C+101%2C+102%2C+103%2C+104%2C+105%2C+106%2C+107%2C+108%2C+109%2C+110%2C+111%2C+112%2C+113%2C+114%2C+115%2C+116%2C+117%2C+118%2C+119%2C+120%2C+121%2C+122%2C+123%2C+124%2C+125%2C+126%2C+127%2C+128%2C+129%2C+130%2C+131%2C+132%2C+133%2C+134%2C+135%2C+136%2C+137%2C+138%2C+139%2C+140%2C+141%2C+142%2C+143%2C+144%2C+145%2C+146%2C+147%2C+148%2C+149%2C+150%2C+151%2C+152%2C+153%2C+154%2C+155%2C+156%2C+157%2C+158%2C+159%2C+160%2C+161%2C+162%2C+163%2C+164%2C+165%2C+166%2C+167%2C+168%2C+169%2C+170%2C+171%2C+172%2C+173%2C+174%2C+175%2C+176%2C+177%2C+178%2C+179%2C+180%2C+181%2C+182%2C+183%2C+184%2C+185%2C+186%2C+187%2C+188%2C+189%2C+190%2C+191%2C+192%2C+193%2C+194%2C+195%2C+196%2C+197%2C+198%2C+199%2C+200"
This returns the full list of tokens, where I'd expect only the first 50 (or really any 50, it doesn't matter for this).
{"token":"1","start_offset":0,"end_offset":1,"type":"<NUM>","position":0},
...
{"token":"199","start_offset":882,"end_offset":885,"type":"<NUM>","position":19998},
{"token":"200","start_offset":887,"end_offset":890,"type":"<NUM>","position":20099}]}