Hello.
I don't understand highlighting logic of elasticsearch.
Here is my test:
Elasticsearch 1.7.1
Query:
{
"query":{
"span_near":{
"clauses":[
{
"span_term":{
"Text":{
"value":"Test1"
}
}
},
{
"span_or":{
"clauses":[
{
"span_term":{
"Text":{
"value":"test2"
}
}
},
{
"span_near":{
"clauses":[
{
"span_term":{
"Text":{
"value":"foo"
}
}
},
{
"span_term":{
"Text":{
"value":"test3"
}
}
}
],
"slop":1,
"in_order":true
}
}
]
}
}
],
"slop":20,
"in_order":false
}
},
"highlight" : {
"fields" : {
"*" : {}
}
}
}
Example 1:
Text: "Test1 test3 test2"
Highlighting response: "<em>Test1</em> <em>test3</em> <em>test2</em>"
Highlight term "test3" is not expected, because in query there is span_near with two terms.
Example 2:
Text: "Test1 test2 test3"
Highlighting response will be: "<em>Test1</em> <em>test2</em> test3"
"test3" here is not highlighted.
Could someone explain me why "test3" is highlighted in first example?
P.S. In tests used plain highlighter.