Few words in data stream rsults in data loss using logstash elastic search

Hi
I am using logstash 5.5.0 and elastic search 5.5.0 for inserting the data from txt file.
I have observed if there are few words like CONSOLIDATED,MANDATE,DATED,DATE,UPDATED,OUTDATED,UOI AS part of the field value then the data is not inserted and data is lost.
But if the same words are in lower case the data gets inserted.
Has anyone faced such issues.

Also if double quote(") is present as part of data fields it throws exception.
Badly need help!!!!