oak-lucene/src/main/java/org/apache/jackrabbit/oak/plugins/index/lucene/util/IndexDefinitionBuilder.java [154:166]:
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    public IndexDefinitionBuilder addTags(String ... additionalTagVals) {
        Set<String> currTags = Collections.emptySet();
        if (tree.hasProperty(INDEX_TAGS)) {
            currTags = Sets.newHashSet(tree.getProperty(INDEX_TAGS).getValue(STRINGS));
        }
        Set<String> tagVals = Sets.newHashSet(Iterables.concat(currTags, asList(additionalTagVals)));
        boolean noAdditionalTags = currTags.containsAll(tagVals);
        if (!noAdditionalTags) {
            tree.removeProperty(INDEX_TAGS);
            tree.setProperty(INDEX_TAGS, asList(Iterables.toArray(tagVals, String.class)), STRINGS);
        }
        return this;
    }
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oak-search/src/main/java/org/apache/jackrabbit/oak/plugins/index/search/util/IndexDefinitionBuilder.java [166:178]:
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    public IndexDefinitionBuilder addTags(String... additionalTagVals) {
        Set<String> currTags = Collections.emptySet();
        if (tree.hasProperty(INDEX_TAGS)) {
            currTags = Sets.newHashSet(tree.getProperty(INDEX_TAGS).getValue(STRINGS));
        }
        Set<String> tagVals = Sets.newHashSet(Iterables.concat(currTags, asList(additionalTagVals)));
        boolean noAdditionalTags = currTags.containsAll(tagVals);
        if (!noAdditionalTags) {
            tree.removeProperty(INDEX_TAGS);
            tree.setProperty(INDEX_TAGS, asList(Iterables.toArray(tagVals, String.class)), STRINGS);
        }
        return this;
    }
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