# Fast vector highlighter does not work with explicit span\_near queries

**URL:** <https://discuss.elastic.co/t/fast-vector-highlighter-does-not-work-with-explicit-span-near-queries/16525>\
**Category:** Elasticsearch\
**Created:** [March 21, 2014, 1:00pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-does-not-work-with-explicit-span-near-queries/16525 "2014-03-21T13:00:33Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Harry\_Waye\_2](https://avatars.discourse-cdn.com/v4/letter/h/b2d939/32.png) [@Harry\_Waye\_2](https://discuss.elastic.co/u/Harry_Waye_2)\
**Post date:** [March 21, 2014, 1:00pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-does-not-work-with-explicit-span-near-queries/16525/1 "2014-03-21T13:00:33Z")

</div>

I'm trying to use fvh with span\_near queries but it appears to be totally  
broken. Other query types work, even it's query\_string equivalent. Is  
there anything I am doing incorrectly here? Or is there a work around that  
I can employ in the meantime? Below is a recreation:

# Set up index with mappings

curl -XPOST localhost:9200/a -d '{  
"mappings": {  
"document": {  
"properties": {  
"text": {  
"type": "string",  
"term\_vector": "with\_positions\_offsets"  
}  
}  
}  
}  
}'

# Put text to field with positions offsets

curl -XPOST localhost:9200/a/document/1 -d '{"text": "a b"}'

# Query with fvh highlighter gives no highlight

curl -XPOST localhost:9200/a/document/\_search -d '{  
"query": {  
"span\_near": {  
"slop": 0,  
"clauses": [{"span\_term": {"text": "a"}}, {"span\_term": {"text": "b"}}]  
}  
},  
"highlight": {"fields": {"text": {"type":"fvh"}}}  
}'

# {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.22145195,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.22145195, "\_source" : {"text": "a b"}}]}}

# Query with plain

curl -XPOST localhost:9200/a/document/\_search -d '{  
"query": {  
"span\_near": {  
"slop": 0,  
"clauses": [{"span\_term": {"text": "a"}}, {"span\_term": {"text": "b"}}]  
}  
},  
"highlight": {"fields": {"text": {"type":"plain"}}}  
}'

# {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.22145195,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.22145195, "\_source" : {"text": "a b"},"highlight":{"text":["_a_ _b_"]}}]}}

curl -XPOST localhost:9200/a/document/\_search -d '{  
"query": {  
"query\_string": {  
"query": ""a b"~0",  
"default\_field": "text"  
}  
},  
"highlight": {"fields": {"text": {"type":"fvh"}}}  
}'

# {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.38356602,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.38356602, "\_source" : {"text": "a b"},"highlight":{"text":["_a b_"]}}]}}

# Try a match query

curl -XPOST localhost:9200/a/document/\_search -d '{  
"query": {  
"match": {  
"text": "a b"  
}  
},  
"highlight": {"fields": {"text": {"type":"fvh"}}}  
}'

# {"took":14,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.2712221,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.2712221, "\_source" : {"text": "a b"},"highlight":{"text":["_a_ _b_"]}}]}}

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<div class="post-metadata">

**Author:** ![Harry\_Waye\_2](https://avatars.discourse-cdn.com/v4/letter/h/b2d939/32.png) [@Harry\_Waye\_2](https://discuss.elastic.co/u/Harry_Waye_2)\
**Post date:** [March 21, 2014, 1:01pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-does-not-work-with-explicit-span-near-queries/16525/2 "2014-03-21T13:01:21Z")

</div>

FYI this is ES 1.0.1

On Friday, March 21, 2014 1:00:33 PM UTC, Harry Waye wrote:

> I'm trying to use fvh with span\_near queries but it appears to be totally  
> broken. Other query types work, even it's query\_string equivalent. Is  
> there anything I am doing incorrectly here? Or is there a work around that  
> I can employ in the meantime? Below is a recreation:
> 
> # Set up index with mappings
> 
> curl -XPOST localhost:9200/a -d '{  
> "mappings": {  
> "document": {  
> "properties": {  
> "text": {  
> "type": "string",  
> "term\_vector": "with\_positions\_offsets"  
> }  
> }  
> }  
> }  
> }'
> 
> # Put text to field with positions offsets
> 
> curl -XPOST localhost:9200/a/document/1 -d '{"text": "a b"}'
> 
> # Query with fvh highlighter gives no highlight
> 
> curl -XPOST localhost:9200/a/document/\_search -d '{  
> "query": {  
> "span\_near": {  
> "slop": 0,  
> "clauses": [{"span\_term": {"text": "a"}}, {"span\_term": {"text": "b"}}]  
> }  
> },  
> "highlight": {"fields": {"text": {"type":"fvh"}}}  
> }'
> 
> # {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.22145195,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.22145195, "\_source" : {"text": "a b"}}]}}
> 
> # Query with plain
> 
> curl -XPOST localhost:9200/a/document/\_search -d '{  
> "query": {  
> "span\_near": {  
> "slop": 0,  
> "clauses": [{"span\_term": {"text": "a"}}, {"span\_term": {"text": "b"}}]  
> }  
> },  
> "highlight": {"fields": {"text": {"type":"plain"}}}  
> }'
> 
> # {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.22145195,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.22145195, "\_source" : {"text": "a b"},"highlight":{"text":["_a_ _b_"]}}]}}
> 
> curl -XPOST localhost:9200/a/document/\_search -d '{  
> "query": {  
> "query\_string": {  
> "query": ""a b"~0",  
> "default\_field": "text"  
> }  
> },  
> "highlight": {"fields": {"text": {"type":"fvh"}}}  
> }'
> 
> # {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.38356602,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.38356602, "\_source" : {"text": "a b"},"highlight":{"text":["_a b_"]}}]}}
> 
> # Try a match query
> 
> curl -XPOST localhost:9200/a/document/\_search -d '{  
> "query": {  
> "match": {  
> "text": "a b"  
> }  
> },  
> "highlight": {"fields": {"text": {"type":"fvh"}}}  
> }'
> 
> # {"took":14,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.2712221,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.2712221, "\_source" : {"text": "a b"},"highlight":{"text":["_a_ _b_"]}}]}}

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<div class="post-metadata">

**Author:** ![Robert\_Muir\_2](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/robert_muir_2/32/931_2.png) [@Robert\_Muir\_2](https://discuss.elastic.co/u/Robert_Muir_2)\
**Post date:** [March 22, 2014, 1:56pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-does-not-work-with-explicit-span-near-queries/16525/3 "2014-03-22T13:56:36Z")

</div>

FVH definitely doesn't recognize span-near queries. In general, when  
it comes to the spanquery family the plain highlighter will work  
better because it has explicit support for those queries.

Maybe you want to open an issue? Its not obvious how to fix though,  
because of how span-near queries can arbitrarily nest, yet fvh's  
design needs to "flatten" the query to a simple list of queries and  
phrases.

In the meantime, I'd recommend the plain highlighter.

On Fri, Mar 21, 2014 at 9:01 AM, Harry Waye [harry@arachnys.com](mailto:harry@arachnys.com) wrote:

> FYI this is ES 1.0.1
> 
> On Friday, March 21, 2014 1:00:33 PM UTC, Harry Waye wrote:
> 
> > I'm trying to use fvh with span\_near queries but it appears to be totally  
> > broken. Other query types work, even it's query\_string equivalent. Is  
> > there anything I am doing incorrectly here? Or is there a work around that  
> > I can employ in the meantime? Below is a recreation:
> > 
> > # Set up index with mappings
> > 
> > curl -XPOST localhost:9200/a -d '{  
> > "mappings": {  
> > "document": {  
> > "properties": {  
> > "text": {  
> > "type": "string",  
> > "term\_vector": "with\_positions\_offsets"  
> > }  
> > }  
> > }  
> > }  
> > }'
> > 
> > # Put text to field with positions offsets
> > 
> > curl -XPOST localhost:9200/a/document/1 -d '{"text": "a b"}'
> > 
> > # Query with fvh highlighter gives no highlight
> > 
> > curl -XPOST localhost:9200/a/document/\_search -d '{  
> > "query": {  
> > "span\_near": {  
> > "slop": 0,  
> > "clauses": [{"span\_term": {"text": "a"}}, {"span\_term": {"text":  
> > "b"}}]  
> > }  
> > },  
> > "highlight": {"fields": {"text": {"type":"fvh"}}}  
> > }'
> > 
> > # 
> > 
> > {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.22145195,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.22145195,  
> > "\_source" : {"text": "a b"}}]}}
> > 
> > # Query with plain
> > 
> > curl -XPOST localhost:9200/a/document/\_search -d '{  
> > "query": {  
> > "span\_near": {  
> > "slop": 0,  
> > "clauses": [{"span\_term": {"text": "a"}}, {"span\_term": {"text":  
> > "b"}}]  
> > }  
> > },  
> > "highlight": {"fields": {"text": {"type":"plain"}}}  
> > }'
> > 
> > # 
> > 
> > {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.22145195,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.22145195,  
> > "\_source" : {"text": "a b"},"highlight":{"text":["_a_  
> > _b_"]}}]}}
> > 
> > curl -XPOST localhost:9200/a/document/\_search -d '{  
> > "query": {  
> > "query\_string": {  
> > "query": ""a b"~0",  
> > "default\_field": "text"  
> > }  
> > },  
> > "highlight": {"fields": {"text": {"type":"fvh"}}}  
> > }'
> > 
> > # 
> > 
> > {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.38356602,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.38356602,  
> > "\_source" : {"text": "a b"},"highlight":{"text":["_a b_"]}}]}}
> > 
> > # Try a match query
> > 
> > curl -XPOST localhost:9200/a/document/\_search -d '{  
> > "query": {  
> > "match": {  
> > "text": "a b"  
> > }  
> > },  
> > "highlight": {"fields": {"text": {"type":"fvh"}}}  
> > }'
> > 
> > # 
> > 
> > {"took":14,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.2712221,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.2712221,  
> > "\_source" : {"text": "a b"},"highlight":{"text":["_a_  
> > _b_"]}}]}}
> 
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<div class="post-metadata">

**Author:** ![Harry\_Waye\_2](https://avatars.discourse-cdn.com/v4/letter/h/b2d939/32.png) [@Harry\_Waye\_2](https://discuss.elastic.co/u/Harry_Waye_2)\
**Post date:** [March 22, 2014, 2:26pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-does-not-work-with-explicit-span-near-queries/16525/4 "2014-03-22T14:26:36Z")

</div>

Thanks Robert, a useful caveat to add to the highlighter docs?

The reason I looked in to using the fvh was due to the plain highlighter  
not using the correct analyzer if the index analyzer was specified  
specified via a path in the indexed document (\_analyzer: {path: ...}).  
Looks like an easy fix though.

I'll add issues for both.

On Saturday, March 22, 2014 1:56:36 PM UTC, Robert Muir wrote:

> FVH definitely doesn't recognize span-near queries. In general, when  
> it comes to the spanquery family the plain highlighter will work  
> better because it has explicit support for those queries.
> 
> Maybe you want to open an issue? Its not obvious how to fix though,  
> because of how span-near queries can arbitrarily nest, yet fvh's  
> design needs to "flatten" the query to a simple list of queries and  
> phrases.
> 
> In the meantime, I'd recommend the plain highlighter.
> 
> On Fri, Mar 21, 2014 at 9:01 AM, Harry Waye \<[ha...@arachnys.com](mailto:ha...@arachnys.com)\<javascript:\>\>  
> wrote:
> 
> > FYI this is ES 1.0.1
> > 
> > On Friday, March 21, 2014 1:00:33 PM UTC, Harry Waye wrote:
> > 
> > > I'm trying to use fvh with span\_near queries but it appears to be  
> > > totally  
> > > broken. Other query types work, even it's query\_string equivalent. Is  
> > > there anything I am doing incorrectly here? Or is there a work around  
> > > that  
> > > I can employ in the meantime? Below is a recreation:
> > > 
> > > # Set up index with mappings
> > > 
> > > curl -XPOST localhost:9200/a -d '{  
> > > "mappings": {  
> > > "document": {  
> > > "properties": {  
> > > "text": {  
> > > "type": "string",  
> > > "term\_vector": "with\_positions\_offsets"  
> > > }  
> > > }  
> > > }  
> > > }  
> > > }'
> > > 
> > > # Put text to field with positions offsets
> > > 
> > > curl -XPOST localhost:9200/a/document/1 -d '{"text": "a b"}'
> > > 
> > > # Query with fvh highlighter gives no highlight
> > > 
> > > curl -XPOST localhost:9200/a/document/\_search -d '{  
> > > "query": {  
> > > "span\_near": {  
> > > "slop": 0,  
> > > "clauses": [{"span\_term": {"text": "a"}}, {"span\_term": {"text":  
> > > "b"}}]  
> > > }  
> > > },  
> > > "highlight": {"fields": {"text": {"type":"fvh"}}}  
> > > }'
> > > 
> > > #
> 
> {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.22145195,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.22145195,
> 
> > > "\_source" : {"text": "a b"}}]}}
> > > 
> > > # Query with plain
> > > 
> > > curl -XPOST localhost:9200/a/document/\_search -d '{  
> > > "query": {  
> > > "span\_near": {  
> > > "slop": 0,  
> > > "clauses": [{"span\_term": {"text": "a"}}, {"span\_term": {"text":  
> > > "b"}}]  
> > > }  
> > > },  
> > > "highlight": {"fields": {"text": {"type":"plain"}}}  
> > > }'
> > > 
> > > #
> 
> {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.22145195,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.22145195,
> 
> > > "\_source" : {"text": "a b"},"highlight":{"text":["_a_  
> > > _b_"]}}]}}
> > > 
> > > curl -XPOST localhost:9200/a/document/\_search -d '{  
> > > "query": {  
> > > "query\_string": {  
> > > "query": ""a b"~0",  
> > > "default\_field": "text"  
> > > }  
> > > },  
> > > "highlight": {"fields": {"text": {"type":"fvh"}}}  
> > > }'
> > > 
> > > #
> 
> {"took":3,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.38356602,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.38356602,
> 
> > > "\_source" : {"text": "a b"},"highlight":{"text":["_a b_"]}}]}}
> > > 
> > > # Try a match query
> > > 
> > > curl -XPOST localhost:9200/a/document/\_search -d '{  
> > > "query": {  
> > > "match": {  
> > > "text": "a b"  
> > > }  
> > > },  
> > > "highlight": {"fields": {"text": {"type":"fvh"}}}  
> > > }'
> > > 
> > > #
> 
> {"took":14,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max\_score":0.2712221,"hits":[{"\_index":"a","\_type":"document","\_id":"1","\_score":0.2712221,
> 
> > > "\_source" : {"text": "a b"},"highlight":{"text":["_a_  
> > > _b_"]}}]}}
> > 
> > --  
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> 
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> 
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**Author:** ![Robert\_Muir\_2](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/robert_muir_2/32/931_2.png) [@Robert\_Muir\_2](https://discuss.elastic.co/u/Robert_Muir_2)\
**Post date:** [March 22, 2014, 2:43pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-does-not-work-with-explicit-span-near-queries/16525/5 "2014-03-22T14:43:51Z")

</div>

On Sat, Mar 22, 2014 at 10:26 AM, Harry Waye [harry@arachnys.com](mailto:harry@arachnys.com) wrote:

> Thanks Robert, a useful caveat to add to the highlighter docs?

Yes, I think so.

> The reason I looked in to using the fvh was due to the plain highlighter not  
> using the correct analyzer if the index analyzer was specified specified via  
> a path in the indexed document (\_analyzer: {path: ...}). Looks like an easy  
> fix though.
> 
> I'll add issues for both.

Thanks!

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---

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**Author:** ![Harry\_Waye\_2](https://avatars.discourse-cdn.com/v4/letter/h/b2d939/32.png) [@Harry\_Waye\_2](https://discuss.elastic.co/u/Harry_Waye_2)\
**Post date:** [March 23, 2014, 4:39pm UTC](https://discuss.elastic.co/t/fast-vector-highlighter-does-not-work-with-explicit-span-near-queries/16525/6 "2014-03-23T16:39:37Z")

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On a related note, given that I've now enabled postitions offsets on a  
field that will no longer be useful, is there some way of removing these  
without reindexing everything. I'm happy to perform some low level lucene  
surgery but unsure what would be required i.e. how do I update the lucene  
indices and how do I update the mappings? Reindexing can take some time so  
I'd like to avoid if possible.

On Saturday, March 22, 2014 2:43:51 PM UTC, Robert Muir wrote:

> On Sat, Mar 22, 2014 at 10:26 AM, Harry Waye \<[ha...@arachnys.com](mailto:ha...@arachnys.com)\<javascript:\>\>  
> wrote:
> 
> > Thanks Robert, a useful caveat to add to the highlighter docs?
> 
> Yes, I think so.
> 
> > The reason I looked in to using the fvh was due to the plain highlighter  
> > not  
> > using the correct analyzer if the index analyzer was specified specified  
> > via  
> > a path in the indexed document (\_analyzer: {path: ...}). Looks like an  
> > easy  
> > fix though.
> > 
> > I'll add issues for both.
> 
> Thanks!

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 1:41am UTC](https://discuss.elastic.co/t/fast-vector-highlighter-does-not-work-with-explicit-span-near-queries/16525/7 "2017-07-06T01:41:19Z")

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