For my requirements, I need to have a filter like below:
{
"filter": {
"bool": {
"must": [
{
"bool": {
"should": [
{
"term": {
"field1": "value1x"
}
}
]
}
},
{
"bool": {
"should": [
{
"term": {
"field2": "value2x"
}
}
]
}
}
]
}
}
This is a simplified example. There can be multiple values for the fields
field1 and/or field2 and hence the inner should filter. I know for a fact
that the should filter for field2 will usually match much less documents
than the should filter for field1. After reading this
<http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/_filter_order.html>,
it is clear that had I used field1 and field2 directly under the same must
filter, I should have specified field2 before field1.
Ask:
1. Does the filter ordering theory hold in general for nested filters like
in my case? Will I gain in performance if I put the should filter for
field2 before the should filter for field1? Let's assume that these filters
are not cached.
2. Does the reverse of the filter ordering theory hold for should filters -
that filters matching most documents should appear before filters matching
less documents in a should filter?
3. Does this same theory hold for and/or filters just like it holds for
must/should filters?
4. Just for my information, for this theory to work, the filters must be
"evaluated" in a sequence and not in parallel. Correct?
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