Term text cannot contain HOLE character U+001E; or unit separator character U+001F; this character is reserved

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1

I run today an interesting error message:

Term text cannot contain HOLE character U+001E; this character is reserved

Term text cannot contain unit separator character U+001F; this character is reserved

in search suggesters

    {
    	"suggest":{
    		"regex":{
    			"regex":"[\u001E]",
    			"completion":{
    				"field":"suggest",
    				"size":10,
    				"skip_duplicates":true
    			}
    		}
    	}
    }

or

    {
    	"suggest":{
    		"regex":{
    			"regex":"[\u001F]",
    			"completion":{
    				"field":"suggest",
    				"size":10,
    				"skip_duplicates":true
    			}
    		}
    	}
    }

What is this? Why does this happen?

2

The underlying logic of the completion field uses this character internally and thus it is considered reserved and will not be used for querying.

3

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