anchor.diff:  
   experimental::[]
   
  -IMPORTANT: {es} supports a subset of EQL syntax. See <<eql-syntax-limitations>>.
  +IMPORTANT: {es} supports a subset of {eql-ref}/index.html[EQL syntax]. See
  +<<eql-syntax-limitations>>.
   
   [discrete]
   [[eql-basic-syntax]]
  
positive.code: <   <=   ==   !=   >=   >
  ----
  
  You cannot use comparison operators to compare a variable, such as a field
  value, to another variable, even if those variables are modified using a
  <<eql-functions,function>>.
  
negative.code: 
  To search `text` fields, consider using a <<eql-search-filter-query-dsl,query
  DSL filter>> that contains a <<query-dsl-match-query,`match`>> query.
  ====
  
  [discrete]
  