search for words with direct writing

I create my table with infix=1, and it is deleted, why does this happen?
here I put my index

index advertenciaDup{
type=plain infix=1
path =/opt/manticore/data/advertenciaDup
#stopwords= es, la

What I want is to be able to solve the search for words with different spellings such as caza and casa

infix=1 is wrong. Pls use min_infix_len = 2. Docs here Manticore Search Manual: Creating a table > NLP and tokenization > Wildcard searching settings