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Martijn van Groningen a9ae52e78b
inner hits: Only access stored fields when needed 
Stored fields were still being accessed for nested inner hits even if the _source was not requested.
This was done to figure out the id of the root document. However this is already known higher up the stack.
So instead this change adds the id to the nested search context, so that it is no longer required to be fetched via the stored fields.

In case the _source is large and no source is requested then hot threads like these ones would still appear:

```
100.3% (501.3ms out of 500ms) cpu usage by thread 'elasticsearch[AfXKKfq][search][T#6]'
     2/10 snapshots sharing following 22 elements
       org.apache.lucene.store.DataInput.skipBytes(DataInput.java:352)
       org.apache.lucene.codecs.compressing.CompressingStoredFieldsReader.skipField(CompressingStoredFieldsReader.java:246)
       org.apache.lucene.codecs.compressing.CompressingStoredFieldsReader.visitDocument(CompressingStoredFieldsReader.java:601)
       org.apache.lucene.index.CodecReader.document(CodecReader.java:88)
       org.apache.lucene.index.FilterLeafReader.document(FilterLeafReader.java:411)
       org.elasticsearch.search.fetch.FetchPhase.loadStoredFields(FetchPhase.java:347)
       org.elasticsearch.search.fetch.FetchPhase.createNestedSearchHit(FetchPhase.java:219)
       org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:150)
       org.elasticsearch.search.fetch.subphase.InnerHitsFetchSubPhase.hitsExecute(InnerHitsFetchSubPhase.java:73)
       org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:166)
       org.elasticsearch.search.fetch.subphase.InnerHitsFetchSubPhase.hitsExecute(InnerHitsFetchSubPhase.java:73)
       org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:166)
       org.elasticsearch.search.SearchService.executeFetchPhase(SearchService.java:422)
```

and:

```
8/10 snapshots sharing following 27 elements
       org.apache.lucene.codecs.compressing.LZ4.decompress(LZ4.java:135)
       org.apache.lucene.codecs.compressing.CompressionMode$4.decompress(CompressionMode.java:138)
       org.apache.lucene.codecs.compressing.CompressingStoredFieldsReader$BlockState$1.fillBuffer(CompressingStoredFieldsReader.java:531)
       org.apache.lucene.codecs.compressing.CompressingStoredFieldsReader$BlockState$1.readBytes(CompressingStoredFieldsReader.java:550)
       org.apache.lucene.store.DataInput.readBytes(DataInput.java:87)
       org.apache.lucene.store.DataInput.skipBytes(DataInput.java:350)
       org.apache.lucene.codecs.compressing.CompressingStoredFieldsReader.skipField(CompressingStoredFieldsReader.java:246)
       org.apache.lucene.codecs.compressing.CompressingStoredFieldsReader.visitDocument(CompressingStoredFieldsReader.java:601)
       org.apache.lucene.index.CodecReader.document(CodecReader.java:88)
       org.apache.lucene.index.FilterLeafReader.document(FilterLeafReader.java:411)
       org.elasticsearch.search.fetch.FetchPhase.loadStoredFields(FetchPhase.java:347)
       org.elasticsearch.search.fetch.FetchPhase.createNestedSearchHit(FetchPhase.java:219)
       org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:150)
       org.elasticsearch.search.fetch.subphase.InnerHitsFetchSubPhase.hitsExecute(InnerHitsFetchSubPhase.java:73)
       org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:166)
       org.elasticsearch.search.fetch.subphase.InnerHitsFetchSubPhase.hitsExecute(InnerHitsFetchSubPhase.java:73)
       org.elasticsearch.search.fetch.FetchPhase.execute(FetchPhase.java:166)
       org.elasticsearch.search.SearchService.executeFetchPhase(SearchService.java:422)
```
 		2017-07-25 12:10:59 +02:00
..
src inner hits: Only access stored fields when needed 2017-07-25 12:10:59 +02:00
.gitignore Build: Add fake project to include buildSrc as normal project 2016-05-06 22:26:15 -07:00
build.gradle Add task to look for tests in src/main (#24298) 2017-04-25 21:11:47 -04:00
version.properties Upgrade to lucene-7.0.0-snapshot-00142c9. (#25641) 2017-07-11 13:58:55 +02:00