`intervals` queries fail percolator term extraction

[OrionNebula]

Elasticsearch version (bin/elasticsearch --version): 7.2.0 (deb)

Plugins installed: [ discovery-ec2, analysis-icu ]

JVM version (java -version): 1.8.0_131

OS version (uname -a if on a Unix-like system): Linux 4.4.0-1085-aws #96-Ubuntu SMP Tue Jun 11 09:08:32 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Description of the problem including expected versus actual behavior:

Percolator queries that contain an intervals clause fail term extraction.

Expected: Intervals queries will be supported by percolator term extraction and pre-filtering.
Actual: Intervals queries fail term extraction and are always considered for percolation.

Steps to reproduce:

1. Create an index containing a percolator field (name doesn't matter, but I used "query")
2. Index a query containing an intervals clause
3. Search for { "term": { "query.extraction_result": "failed" } }

[elasticmachine]

Pinging @elastic/es-search

[jimczi]

@romseygeek can you take a look ?