fix elastic searching

[stefangutica]

Reasoning

• We found an edge case in transactions timeframe filtering when combining after and before across legacy and modern data.
• Specifically, if after pointed to an older period (legacy docs using timestamp) and before pointed to a newer period (docs using timestampMs), queries could miss results when the dataset in that interval contained only documents without timestampMs.
• In that scenario, legacy documents were unintentionally excluded because the mixed condition favored the modern path in a way that did not consistently preserve fallback behavior.

Proposed Changes

• Normalize timeframe filtering to first query by timestampMs when present.
• Keep explicit fallback to timestamp for documents that do not have timestampMs.
• Apply the same priority/fallback approach consistently so mixed historical ranges return both modern and legacy documents correctly.

How to test

• Query a range that includes mixed data (documents with and without timestampMs) and verify results are still returned correctly.
• Validate ordering for block lookup: records with timestampMs should be sorted by timestampMs, with legacy records correctly ordered via timestamp.
• Run the existing lint/type checks (or targeted tests for indexer queries) and confirm no regressions.

[github-actions]

k6 load testing comparison.
Base Commit Hash: 58eae3e
Target Commit Hash: d9020a5

Metric	Base				Target				Diff
	Avg	Max	90	95	Avg	Max	90	95	Avg	Max	90	95
Accounts	107.21	1278.21	113.33	119.84	65.19	1013.39	66.67	69.26	-39.20% ✅	-20.72% ✅	-41.17% ✅	-42.20% ✅
Blocks	83.47	1466.58	91.81	95.00	72.27	766.39	67.38	92.13	-13.42% ✅	-47.74% ✅	-26.61% ✅	-3.02% ✅
Mex	53.57	1172.20	56.13	58.39	63.23	1186.80	66.30	69.26	+18.01% 🔴	+1.25% 🔴	+18.14% 🔴	+18.60% 🔴
Pool	53.42	397.90	56.18	58.47	62.52	651.30	66.31	69.18	+17.04% 🔴	+63.69% 🔴	+18.03% 🔴	+18.32% 🔴
Nodes	54.09	1250.45	56.25	58.50	62.08	457.81	66.31	69.03	+14.77% 🔴	-63.39% ✅	+17.88% 🔴	+18.00% 🔴
Transactions	107.44	1281.38	112.86	118.95	80.47	3372.45	67.48	78.42	-25.10% ✅	+163.19% 🔴	-40.21% ✅	-34.08% ✅
Tokens	53.48	397.92	56.29	58.75	63.10	1206.04	66.37	69.15	+18.00% 🔴	+203.08% 🔴	+17.92% 🔴	+17.70% 🔴
Test Run Duration	60007.49				60001.99

Legend: Avg - Average Response Time, Max - Maximum Response Time, 90 - 90th Percentile, 95 - 95th Percentile
All times are in milliseconds.