[DOCS] Correct DFI docs regarding stop word removal (#53836)
[DOCS] Correct DFI docs regarding stop word removal (#53836)

The documentation of DFI should recommend *not* to [remove stop words][1], since DFI is good at scoring queries that contain common terms: `the wall`, `the sun`, `the who`, etc.

[1]:https://lucene.apache.org/core/8_1_1/core/org/apache/lucene/search/similarities/DFISimilarity.html
gingerwizard/elasticsearch,GlenRSmith/elasticsearch,uschindler/elasticsearch,HonzaKral/elasticsearch,GlenRSmith/elasticsearch,robin13/elasticsearch,GlenRSmith/elasticsearch,robin13/elasticsearch,scorpionvicky/elasticsearch,gingerwizard/elasticsearch,nknize/elasticsearch,gingerwizard/elasticsearch,gingerwizard/elasticsearch,robin13/elasticsearch,gingerwizard/elasticsearch,gingerwizard/elasticsearch,uschindler/elasticsearch,GlenRSmith/elasticsearch,scorpionvicky/elasticsearch,GlenRSmith/elasticsearch,uschindler/elasticsearch,HonzaKral/elasticsearch,scorpionvicky/elasticsearch,robin13/elasticsearch,uschindler/elasticsearch,nknize/elasticsearch,nknize/elasticsearch,scorpionvicky/elasticsearch,uschindler/elasticsearch,nknize/elasticsearch,gingerwizard/elasticsearch,nknize/elasticsearch,robin13/elasticsearch,HonzaKral/elasticsearch,HonzaKral/elasticsearch,scorpionvicky/elasticsearch