Java Code Examples for org.elasticsearch.search.internal.SearchContext#setCurrent()

@Override
protected ShardExistsResponse shardOperation(ShardExistsRequest request) {
    IndexService indexService = indicesService.indexServiceSafe(request.shardId().getIndex());
    IndexShard indexShard = indexService.shardSafe(request.shardId().id());

    SearchShardTarget shardTarget = new SearchShardTarget(clusterService.localNode().id(), request.shardId().getIndex(), request.shardId().id());
    SearchContext context = new DefaultSearchContext(0,
            new ShardSearchLocalRequest(request.types(), request.nowInMillis(), request.filteringAliases()),
            shardTarget, indexShard.acquireSearcher("exists"), indexService, indexShard,
            scriptService, pageCacheRecycler, bigArrays, threadPool.estimatedTimeInMillisCounter(), parseFieldMatcher,
            SearchService.NO_TIMEOUT
    );
    SearchContext.setCurrent(context);

    try {
        if (request.minScore() != DEFAULT_MIN_SCORE) {
            context.minimumScore(request.minScore());
        }
        BytesReference source = request.querySource();
        if (source != null && source.length() > 0) {
            try {
                QueryParseContext.setTypes(request.types());
                context.parsedQuery(indexService.queryParserService().parseQuery(source));
            } finally {
                QueryParseContext.removeTypes();
            }
        }
        context.preProcess();
        try {
            boolean exists;
            try {
                exists = Lucene.exists(context.searcher(), context.query());
            } finally {
                context.clearReleasables(SearchContext.Lifetime.COLLECTION);
            }
            return new ShardExistsResponse(request.shardId(), exists);
        } catch (Exception e) {
            throw new QueryPhaseExecutionException(context, "failed to execute exists", e);
        }
    } finally {
        // this will also release the index searcher
        context.close();
        SearchContext.removeCurrent();
    }
}
 

@Override
protected ExplainResponse shardOperation(ExplainRequest request, ShardId shardId) {
    IndexService indexService = indicesService.indexServiceSafe(shardId.getIndex());
    IndexShard indexShard = indexService.shardSafe(shardId.id());
    Term uidTerm = new Term(UidFieldMapper.NAME, Uid.createUidAsBytes(request.type(), request.id()));
    Engine.GetResult result = indexShard.get(new Engine.Get(false, uidTerm));
    if (!result.exists()) {
        return new ExplainResponse(shardId.getIndex(), request.type(), request.id(), false);
    }

    SearchContext context = new DefaultSearchContext(
            0, new ShardSearchLocalRequest(new String[]{request.type()}, request.nowInMillis, request.filteringAlias()),
            null, result.searcher(), indexService, indexShard,
            scriptService, pageCacheRecycler,
            bigArrays, threadPool.estimatedTimeInMillisCounter(), parseFieldMatcher,
            SearchService.NO_TIMEOUT
    );
    SearchContext.setCurrent(context);

    try {
        context.parsedQuery(indexService.queryParserService().parseQuery(request.source()));
        context.preProcess();
        int topLevelDocId = result.docIdAndVersion().docId + result.docIdAndVersion().context.docBase;
        Explanation explanation = context.searcher().explain(context.query(), topLevelDocId);
        for (RescoreSearchContext ctx : context.rescore()) {
            Rescorer rescorer = ctx.rescorer();
            explanation = rescorer.explain(topLevelDocId, context, ctx, explanation);
        }
        if (request.fields() != null || (request.fetchSourceContext() != null && request.fetchSourceContext().fetchSource())) {
            // Advantage is that we're not opening a second searcher to retrieve the _source. Also
            // because we are working in the same searcher in engineGetResult we can be sure that a
            // doc isn't deleted between the initial get and this call.
            GetResult getResult = indexShard.getService().get(result, request.id(), request.type(), request.fields(), request.fetchSourceContext(), false);
            return new ExplainResponse(shardId.getIndex(), request.type(), request.id(), true, explanation, getResult);
        } else {
            return new ExplainResponse(shardId.getIndex(), request.type(), request.id(), true, explanation);
        }
    } catch (IOException e) {
        throw new ElasticsearchException("Could not explain", e);
    } finally {
        context.close();
        SearchContext.removeCurrent();
    }
}
 

/**
 * The operation that executes the query and generates a {@link TermsByQueryShardResponse} for each shard.
 */
@Override
protected TermsByQueryShardResponse shardOperation(TermsByQueryShardRequest shardRequest) throws ElasticsearchException {
  IndexService indexService = indicesService.indexServiceSafe(shardRequest.shardId().getIndex());
  IndexShard indexShard = indexService.shardSafe(shardRequest.shardId().id());
  TermsByQueryRequest request = shardRequest.request();
  OrderByShardOperation orderByOperation = OrderByShardOperation.get(request.getOrderBy(), request.maxTermsPerShard());

  SearchShardTarget shardTarget = new SearchShardTarget(clusterService.localNode().id(),
                                                        shardRequest.shardId().getIndex(),
                                                        shardRequest.shardId().id());

  ShardSearchRequest shardSearchRequest = new ShardSearchLocalRequest(request.types(), request.nowInMillis(),
                                                                      shardRequest.filteringAliases());

  SearchContext context = new DefaultSearchContext(0, shardSearchRequest, shardTarget,
    indexShard.acquireSearcher("termsByQuery"), indexService, indexShard, scriptService,
    pageCacheRecycler, bigArrays, threadPool.estimatedTimeInMillisCounter(), parseFieldMatcher,
    SearchService.NO_TIMEOUT);
  SearchContext.setCurrent(context);

  try {
    MappedFieldType fieldType = context.smartNameFieldType(request.field());
    if (fieldType == null) {
      throw new SearchContextException(context, "[termsByQuery] field '" + request.field() +
              "' not found for types " + Arrays.toString(request.types()));
    }

    IndexFieldData indexFieldData = context.fieldData().getForField(fieldType);

    BytesReference querySource = request.querySource();
    if (querySource != null && querySource.length() > 0) {
      XContentParser queryParser = null;
      try {
        queryParser = XContentFactory.xContent(querySource).createParser(querySource);
        QueryParseContext.setTypes(request.types());
        ParsedQuery parsedQuery = orderByOperation.getParsedQuery(queryParser, indexService);
        if (parsedQuery != null) {
          context.parsedQuery(parsedQuery);
        }
      }
      finally {
        QueryParseContext.removeTypes();
        if (queryParser != null) {
          queryParser.close();
        }
      }
    }

    context.preProcess();

    // execute the search only gathering the hit count and bitset for each segment
    logger.debug("{}: Executes search for collecting terms {}", Thread.currentThread().getName(),
      shardRequest.shardId());

    TermsCollector termsCollector = this.getTermsCollector(request.termsEncoding(), indexFieldData, context);
    if (request.expectedTerms() != null) termsCollector.setExpectedTerms(request.expectedTerms());
    if (request.maxTermsPerShard() != null) termsCollector.setMaxTerms(request.maxTermsPerShard());
    HitStream hitStream = orderByOperation.getHitStream(context);
    TermsSet terms = termsCollector.collect(hitStream);

    logger.debug("{}: Returns terms response with {} terms for shard {}", Thread.currentThread().getName(),
      terms.size(), shardRequest.shardId());

    return new TermsByQueryShardResponse(shardRequest.shardId(), terms);
  }
  catch (Throwable e) {
    logger.error("[termsByQuery] Error executing shard operation", e);
    throw new QueryPhaseExecutionException(context, "[termsByQuery] Failed to execute query", e);
  }
  finally {
    // this will also release the index searcher
    context.close();
    SearchContext.removeCurrent();
  }
}