I'm new to Elasticsearch and I have two questions. I've done quite a bit of
Google searching and looked at the Elasticsearch tests for guidance, but
I'm not getting the desired result.
I'm querying an Elasticsearch server I don't control, but the index seems
straight forward enough. When I query it via the Java API however, I cannot
get highlights to work. My code looks more or less like this:
SearchRequestBuilder builder = client.prepareSearch(SEARCH_INDEX)
.setTypes(SEARCH_DOCUMENT_TYPE)
.setSearchType(SearchType.QUERY_AND_FETCH)
.addHighlightedField("content")
.addHighlightedField("title")
.addHighlightedField("subject")
.addAggregation(AggregationBuilders.terms("types-count").field("type"))
.setQuery(QueryBuilders.simpleQueryString(query))
.setQuery(QueryBuilders.queryString(query)).execute().actionGet();
I get back results, but I don't get back a "highlight" collection. I get
back this instead:
"highlightFields": {
"content": {
"name": "content",
"fragments": [
{},
{}
]
},
"title": {
"name": "title",
"fragments": [
{}
]
}
}
In other words, it seems like it wanted to find fragments, but it gave me
blank results. Thinking maybe it was something wrong with the index, I
POSTed this to the server:
{ "highlight" : { "fields" : { "content" : {} }
}
, "fields": ["title", "_id", "subject", "uri", "dateEffective"]
}
And got the expected results:
"highlight": {
"content": [
" fuel transfer pump operation,
\r\ninstall Javelin Placard 782-14 or an equivalent FAA-approved
placard",
"73-17-01 CESSNA: Amdt. 39-1701.
Applies to all series of Cessna Models 170, \r\n172, 175, 180 and"
,
", adjacent \r\nto the fuel transfer pump
switch which reads as follows: "AUXILIARY FUEL \r\nTRANSFER PUMP",
". PULL ON. PUSH OFF. PLACE PUMP OFF
BEFORE CHANGING FROM LEFT \r\nTANK." \r\n\r\n\tNOTE: Failure to turn",
" off fuel boost pump allows air to enter
engine \r\nfuel system and may cause engine power failure when"
]
}
It's obvious I'm doing something wrong in the API, but I can't seem to get
it to perform the highlighting I want. Any help?
This leads me to my second question. When trying to debug this, I wanted to
view the "source" or JSON of the request being sent to Elasticsearch so I
could compare but I couldn't find a method for this. I resorted to sniffing
my traffic with Wireshark, but it was not very efficient for viewing what I
was sending to the server.
Is there a log level or something I can set in the Java API?
Thanks!
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